六分仪 - 铸铁, 黄铜 - Nippon Sokki & Co. - Tamaya 银座 考察

项目描述

Vintage Japanese Marine Sextant by Nippon Sokki Co., Ltd. (NSK), Kobe - Manufactured February 18, 1949 - With Original NSK Certificate, Tamaya Ginza Examination Certificate (1956), Original Wood Box, and Accessories

A wonderfully preserved vintage Japanese marine sextant manufactured by Nippon Sokki & Co., Ltd. (日本測器株式会社 / "NSK") of Kobe, Japan - one of the most respected names in mid-20th century Japanese precision optical instruments.

This is a genuine working-class maritime navigation instrument from the immediate post-war period, dated February 18, 1949 (Showa 24) according to the original NSK manufacturer's certificate of examination affixed to the inside lid of the original wooden case.

The sextant was subsequently re-examined and certified by the legendary Tamaya & Co., Ltd. of Ginza, Tokyo - Japan's most prestigious maker of marine instruments - on April 7, 1956.
The original Tamaya certificate of examination (六分儀検定表 / "Certificate of Examination") is preserved in the case alongside the NSK certificate, documenting the instrument's correction values across the entire 15° to 120° range of the arc.
The sextant itself is a classic professional design:

Grey-painted cast frame with the distinctive openwork "skeleton" structure designed to combine strength with light weight
Polished brass arc with engraved silver-inlaid degree scale
Hand-stamped "NSK" maker's mark and serial number "1280" on the arc
Brass index arm with vernier scale and magnifying lens
Brass observation telescope with multiple eyepieces and shade filters (multiple included as accessories)
Index mirror, horizon mirror, and adjustable sun shades (dark glass and blue glass filters)
Wooden handle on the back of the frame
All moving parts function smoothly

The combination of the grey-painted frame, polished brass scope, and brass scale work creates a striking visual effect that is both functionally pure and aesthetically beautiful - the essence of mid-20th century Japanese precision instrument design.
Stored in its original wood hinged case with brass corner reinforcements, brass hardware, and inset carrying handle.
The original key is no longer present.
A genuine piece of Japanese maritime history, dating from the period of Japan's post-war reconstruction when the country's optical and precision instrument industries were rebuilding world-class capabilities.
Equally suited for a serious collector of marine and navigation instruments, for nautical-themed interior design, or as a striking historical conversation piece for a study, library, or maritime-themed space.

Maker Profile
NIPPON SOKKI & CO., LTD. (日本測器株式会社 / "NSK") - Kobe, Japan
Nippon Sokki & Co., Ltd. ("Japan Measuring Instruments Co.") was a respected Kobe-based manufacturer of precision optical and navigational instruments active in mid-20th century Japan.
Kobe, as one of Japan's most important international ports, was a natural center for the manufacture of maritime instruments, with strong demand from the Japanese merchant marine, fishing fleet, and the post-war reconstruction of Japan's shipping industry.

'tAMAYA & CO., LTD. (株式会社玉屋) - Ginza, Tokyo
Tamaya & Co., founded in 1882, is the most prestigious and longest-established Japanese maker of marine instruments, located in Ginza, Tokyo.
Tamaya sextants have been used by professional navigators worldwide for over 140 years and are highly sought after by international collectors.
The Tamaya examination certificate accompanying this NSK sextant indicates that the instrument was professionally serviced and verified by Tamaya in 1956 - lending additional provenance and authentication.

Size
Wooden Box (closed): approx. 28 × 29 × 14.5 cm

Weight
Total (sextant + box + accessories): approx. 5kg

Condition
Very good antique condition for an instrument of approximately 75-77 years of age.
Sextant body:

All moving parts function smoothly
The micrometer drum and vernier scale operate correctly
The arc, silvered scale, and serial number remain clearly legible
Some natural patina and minor surface wear on the grey paint
Some natural patina on the brass components

Mirrors and lenses:

Some minor staining and aging visible on the mirrors (typical for the period)
No cracks or breaks in any of the optical elements
The lenses are clear and functional with light surface haze

Wooden case:

Honest age-related wear and scratches on the exterior
Internal felt/velvet pads and brackets retain the sextant securely
Original NSK certificate of examination still affixed inside the lid (dated 1949)
Original Tamaya certificate of examination preserved (dated 1956)
The original key is no longer present

This is a genuine working antique instrument with the honest patina of historical use.

Accessories Included

Original wooden case (with brass fittings)
Original NSK certificate of examination (1949, affixed to lid)
Original Tamaya & Co., Ltd. certificate of examination (1956)
Multiple telescope tubes and eyepieces
Spare filter caps / accessories as shown in photographs


NOTICE:
The photos may show flowers, plants, pedestals, etc. as examples of decorations and interior design for illustrative purposes, but please note that these are not included in the product.
The lot will be carefully packaged and sent by DHL, FedEx or Japan Post depending on the situation.
It takes about 2-3 weeks to receive normally.
Import duties, taxes, and charges are not included in the item price or shipping cost.
These charges are the buyer's responsibility.
Sometimes Customs or the delivery company in your country may contact you for Customs clearance via phone or email.
Please make sure that you can answer the phone.
If you don't, the parcel will be returned to us and it costs more than double the shipping fee for reshipping.
We do appreciate your kind cooperation.