Alarm clock - Rhythm Watch Co., Ltd, Japan Space Age Transistor Alarm Clock with Italian Flip Calendar, Luminous Space Age Plastic, Metal, Glass - 1970-1980 - Boxed Italian, Day Date

Made in Japan – Vintage 1970s Design – Floating Balance Movement – Fully Working – Excellent Vintage Condition

A fascinating and visually striking example of Japanese vintage clockmaking, combining the futuristic aesthetics of the Space Age era with an ingenious mechanical calendar system and a beautifully detailed luminous analogue dial.

Manufactured by the renowned Japanese clockmaker RHYTHM, the Model 7HA003 is far more than a conventional alarm clock. It combines three distinctive elements within one elegant design: a transistor-controlled floating balance movement, a mechanical flip day-and-date calendar in Italian, and a luminous analogue clock face featuring remarkable graphic detailing.

Particularly attractive is the survival of its original RHYTHM factory cardboard box, bearing the model reference 7HA003RY.

An unusual and highly decorative vintage Japanese timepiece, equally appealing to collectors of historic electronic clocks, mechanical calendars, Space Age design and 1970s decorative objects.

DESIGN – JAPANESE SPACE AGE AESTHETICS

The RHYTHM 7HA003 features a bold architectural rectangular body with gently rounded upper corners, clean geometric lines and an elegantly sculpted lower section.

Its original white plastic housing contrasts beautifully with the deep black dial, creating a sophisticated black-and-white composition characteristic of Japanese modernist electronic design.

The front is dominated by a large, horizontally arranged clock face framed by a metallic-effect trim with softly rounded corners.

The sculpted casing extends downwards into a slightly projecting pedestal base, visually anchoring the clock and giving it a distinctive architectural silhouette.

A dark contrasting strip runs across the lower edge of the base, reinforcing the horizontal proportions of the design.

The overall appearance is simultaneously functional, futuristic and decorative.

Particularly interesting design details include:

Elegant white rectangular plastic housing.

Gently rounded upper corners.

Sculptural lower body and projecting pedestal base.

Large panoramic black dial.

Metallic-effect frame surrounding the clock face.

Contrasting dark base strip.

Oversized graphic hour numerals.

Two vertically arranged mechanical calendar windows.

Side-mounted adjustment controls.

Discreet green-topped alarm control on the upper surface.

The proportions and layout make this an exceptionally attractive desk, shelf or bedside clock, perfectly suited to a vintage design collection or a carefully curated mid-century modern interior.

THE DIAL – A BEAUTIFUL EXAMPLE OF JAPANESE GRAPHIC DESIGN

One of the most remarkable aspects of this model is its highly distinctive analogue dial.

The large black clock face features twelve oversized Arabic numerals arranged around the perimeter, executed in a pale green tone.

Their clean, modern typography gives the dial exceptional legibility while creating a strong visual contrast against the dark background.

Inside the hour numerals is a circular minute track composed of fine red-pink lines and more prominent rectangular hour markers, introducing a subtle but highly effective splash of colour.

A second, smaller circle of delicate white dots surrounds the central area.

The elegant RHYTHM signature, printed in cursive lettering, appears just below the twelve o'clock position.

Below the central hands, the words TRANSISTOR ALARM discreetly identify the clock's electronic technology.

The hands themselves are particularly attractive.

The hour and minute hands feature elongated geometric shapes, contrasting metallic outlines, warm amber-orange central sections and pale green luminous inserts.

The thin secondary hands add further visual depth to the dial.

This combination of oversized pale-green numerals, red minute markers, amber detailing and metallic elements creates an exceptionally sophisticated composition.

The design successfully combines traditional analogue timekeeping with the graphic experimentation and technological optimism associated with the 1970s.

LUMINOUS DIAL – BEAUTIFUL GREEN GLOW IN THE DARK

Another highly attractive feature is the clock's luminous display.

As shown in the accompanying photographs, the large Arabic hour numerals produce a striking green glow in darkness.

Luminous details on the clock hands also remain visible, creating a beautiful contrast with the black background.

The effect is particularly impressive because the luminous numerals appear to float against the dark dial.

This green luminescence enhances both the visual character and the functionality of the clock, allowing the time to be read in low-light conditions.

Important: This is a luminous dial, not an electrically illuminated clock face. The visible glow comes from the luminous material on the numerals and hands rather than from an internal electric lamp. The intensity and duration of the glow depend on previous exposure to light and the surrounding lighting conditions.

The accompanying photographs document the actual luminous appearance of this example.

ORIGINAL ITALIAN MECHANICAL FLIP CALENDAR

Positioned vertically along the left side of the dial is one of the most interesting features of this clock: a beautifully integrated mechanical day-and-date calendar.

Two separate rectangular windows are arranged one above the other, enclosed within a carefully designed frame.

The upper window displays the numerical date of the month, while the lower window displays the day of the week.

Between the two openings, the word CALENDAR is printed directly on the dial.

Unlike an ordinary printed date wheel, this system uses individual mechanical flip cards, creating a fascinating miniature mechanical display.

The calendar is configured in Italian, an especially interesting characteristic of this Japanese-made model.

It incorporates:

Seven days of the week in Italian.

Complete numerical dates from 1 to 31.

Two separate mechanical flip-card mechanisms.

Automatic day-and-date advancement.

Synchronized calendar transitions.

During extended testing, the calendar change was observed to take place between approximately 00:25 and 00:30.

At the moment of transition, both the day and date cards flip simultaneously, producing a particularly satisfying mechanical action.

This ingenious mechanism is one of the most distinctive aspects of the clock and adds considerable visual and technical interest.

TRANSISTOR FLOATING BALANCE MOVEMENT – JAPANESE ELECTROMECHANICAL ENGINEERING

Inside the clock is an interesting Japanese transistor-controlled floating balance movement.

This type of electromechanical mechanism represents an important stage in the evolution of domestic timekeeping technology, between traditional mechanical clock movements and later fully electronic quartz systems.

Rather than relying on a conventional mains-powered synchronous motor, the clock uses a battery-operated transistor-controlled regulating system combined with a mechanical balance assembly.

The mechanism is housed beneath a transparent protective cover, allowing its construction and internal components to be appreciated.

A dedicated fine-adjustment control is marked with + and − symbols, allowing the running rate to be regulated.

The transparent movement cover is also marked SCALE = 5 SEC and JAPAN.

The internal construction illustrates the precision and mechanical ingenuity associated with Japanese consumer electronics during this period.

For enthusiasts of vintage horology, this movement provides an additional dimension of interest beyond the clock's exterior design.

TRADITIONAL BELL-TYPE ALARM

The clock features a traditional mechanical bell-type alarm system.

Unlike modern electronic alarms, its characteristic ringing sound is generated by a mechanical striking mechanism.

The alarm has been tested and is working correctly.

The original adjustment and alarm controls are present.

CONDITION – EXCELLENT VINTAGE PRESERVATION

This example is presented in excellent vintage cosmetic condition, particularly attractive considering its age.

The original white housing is exceptionally well preserved, without visible cracks or significant yellowing.

The black dial retains its attractive graphic composition, with the original numerals, coloured markers and hands clearly visible.

The mechanical calendar windows and flip cards also present well.

The luminous details remain visible in darkness, as documented in the photographs.

There may be minor surface traces, small marks and ordinary signs of age consistent with a vintage object.

Please carefully examine all photographs, which form an integral part of the description and accurately document its cosmetic condition.

The original RHYTHM cardboard box is included.

The box retains its distinctive blue-and-white striped design and original identification label, showing the reference 7HA003RY.

The cardboard packaging displays age-related wear and handling marks, consistent with its vintage nature.

FUNCTIONAL TESTING – OVER ONE MONTH

The clock has undergone extended functional testing for more than one month.

Test results:

Clock movement: Fully operational.

Timekeeping: Tested for over one month and keeps time correctly.

Transistor floating balance movement: Operational.

Mechanical alarm: Tested and working.

Numerical date calendar: Working.

Italian day-of-the-week calendar: Working.

Automatic calendar advancement: Working.

Day and date cards: Both change simultaneously.

Calendar transition: Observed between approximately 00:25 and 00:30.

Luminous hour numerals: Visible in darkness.

Luminous hand details: Visible in darkness.

Original adjustment controls: Present.

The clock operates with one 1.5V C-size battery, which is not included in the sale.

As with any vintage electromechanical clock, small variations in running rate may occur over time or following transport, and fine regulation may occasionally be necessary.

VIDEO – WATCH THE CLOCK IN OPERATION

A video documenting the clock's operation is available at the following link:

https://youtu.be/1SxgtmQLKWs

The video provides an additional opportunity to appreciate the movement and functional characteristics of this distinctive vintage RHYTHM timepiece.

TECHNICAL SPECIFICATIONS

Manufacturer: RHYTHM

Model: 7HA003

Original box reference: 7HA003RY

Country of manufacture: Japan

Period: Vintage, 1970s style

Type: Transistor alarm clock with mechanical flip calendar

Movement: Transistor-controlled floating balance

Rate regulation: Adjustable + / −

Alarm: Traditional mechanical bell-type alarm

Calendar: Mechanical flip display

Calendar language: Italian

Calendar functions: Day of the week and numerical date, 1–31

Dial: Black with oversized pale-green Arabic numerals

Dial details: Red-pink minute markers, dotted inner scale and geometric hands

Luminosity: Green luminous hour numerals and luminous hand details

Housing colour: White

Power supply: 1 × 1.5V C-size battery

Height: 14 cm

Width: 19 cm

Depth: 8 cm

Condition: Excellent vintage condition, fully working

Original cardboard box: Included

Battery: Not included

COLLECTOR'S APPEAL

What makes this RHYTHM 7HA003 particularly appealing is the combination of its unusual technical features and its exceptionally attractive appearance.

The highly graphic luminous dial, Italian mechanical flip calendar, synchronized date-changing mechanism, transistor floating balance movement and original packaging together create a distinctive example of Japanese vintage design.

Its visual language captures the spirit of an era when everyday domestic objects were increasingly influenced by modern electronics, experimental typography and futuristic industrial design.

The clock is equally interesting as a functional vintage timepiece, a decorative Space Age object or an addition to a collection of Japanese mechanical and electronic clocks.

A beautifully preserved example with a distinctive personality, original packaging and documented operation.
Vintage Condition

This is an original vintage item, not a newly manufactured product. Minor signs of age, use, handling or storage may be present. These characteristics are consistent with its age and should not be interpreted as defects unless specifically described.

Functional Testing

The clock has been carefully tested and was operating as described at the time of testing. However, due to its vintage electromechanical construction, no guarantee can be provided regarding future performance, long-term accuracy or the continued operation of individual components.

Fine adjustments may be necessary after transport or during normal use.

Luminous Material

The luminous appearance shown in the photographs was documented under dark conditions. Brightness and duration of the glow can vary according to light exposure, environmental conditions and the age of the luminous material.

Photographs & Description

Please examine all photographs carefully and read the complete description before placing a bid. The photographs are an essential part of the item's condition report.

Colour Representation

Actual colours, tones and surface appearance may vary slightly depending on lighting conditions, photography and individual screen settings.

Accessories

Only the clock and its original cardboard box are included. The 1.5V C-size battery is not included.

Professional Packaging

The item will be carefully packed using appropriate protective materials and double-box packaging whenever necessary to reduce the risk of damage during transportation.

Shipping

Tracking information will be provided once the parcel has been dispatched.

Important Notice

By placing a bid, the buyer acknowledges having reviewed the complete description, functional information, photographs and vintage condition of the item.