Tudor - Prince Oysterdate - 90500 - Men - 1970-1979

Tudor Prince Oysterdate 90500 – 34 mm – automatic – blue dial – date – Rolex Oyster case – vintage

The Tudor Prince Oysterdate 90500 is a classic vintage automatic Tudor with the recognizable Oyster construction from the period when Tudor made ample use of Rolex case components. This specimen combines a 34 mm stainless steel case with a deep blue dial, applied hour markers, date display with cyclops lens, and a steel Oyster-style bracelet.

The blue dial bears the Tudor shield at 12 o’clock and the inscriptions “TUDOR PRINCE OYSTERDATE” and “ROTOR SELF-WINDING.” The screwed crown is equipped with the Rolex crown logo, and on the back there is the classic text “ORIGINAL OYSTER CASE BY ROLEX GENEVA.”

The watch is in worn vintage condition. The case, bracelet, clasp, dial and the plexiglass show signs of use and aging appropriate for a watch from this period.

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Basic information

Brand: Tudor
Model: Prince Oysterdate
Reference: 90500
Type: men’s/unisex wristwatch
Movement: automatic mechanical
Caliber: Tudor/ETA 2784
Case material: stainless steel
Diameter: 34 mm, excluding crown
Dial: blue
Crystal: plexiglass
Date: at 3 o’clock
Date magnifier: cyclops lens
Bracelet: stainless steel Oyster-style bracelet
Clasp: folding clasp
Crown: screw-down Rolex Oyster crown
Case back: screw-down Oyster case back
Frequency: 28,800 vph

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Key details

• Classic Tudor Prince Oysterdate from the vintage Oyster period
• Reference 90500
• 34 mm stainless steel case
• Deep blue dial
• Applied Tudor shield at 12 o’clock
• Applied baton hour markers
• Central seconds hand
• Automatic mechanical movement
• Date window at 3 o’clock
• Cyclops over the date
• Screwed crown with Rolex crown logo
• Back marked “ORIGINAL OYSTER CASE BY ROLEX GENEVA”
• Steel Oyster-style bracelet
• Clasp with Rolex crown logo
• Vintage plexiglass

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Estimated year of manufacture

Estimated year: circa late 1970s / around 1980.

The Tudor Prince Oysterdate reference 90500 belongs to a generation mainly known from the 1970s and around 1980. Without a clearly readable serial number or original documentation, an exact production year cannot be given.

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Case

The classic Oyster case is made of stainless steel and has a diameter of 34 mm excluding the crown.

The case features the characteristic proportions of vintage Tudor- and Rolex Oyster models: a relatively slim rounded middle case, smooth lugs and a polished bezel.

The polished surfaces show signs of wear and fine scratches. Also around the lugs and sides there are traces from years of wear. The case nonetheless retains a neat and attractive vintage appearance.

Diameter: 34 mm
Material: stainless steel
Bezel: smooth, polished
Construction: Oyster-style case
Case back: screwed
Crown: screw-down

Given the age of the watch, no warranty is provided for original water resistance. A pressure test is recommended before exposing the watch to water.

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Dial

One of the most striking features of this example is the deep blue dial.

The color varies with the light from dark navy blue to a distinctly lighter blue shade. Around the outer edge there is a fine white minute/second scale.

At 12 o’clock sits an applied Tudor shield. Below it read:

TUDOR
PRINCE OYSTERDATE

Above 6 o’clock reads:

ROTOR
SELF-WINDING

At the bottom there is the Swiss designation.

The hour markers are applied baton markers. The markers have a warm gold/cream tone and the luminous parts show clear aging.

The hands are also equipped with luminous material. The lume has developed a vintage patina over the years.

The dial shows light signs of age and wear, which are especially visible up close and suit the watch’s vintage character.

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Date

At 3 o’clock is the date display.

Above the date window is a characteristic cyclops lens in the plexiglass, which magnifies the date numeral significantly.

This is one of the most recognizable features of the classic Oysterdate variant.

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Movement

The watch is equipped with an automatic mechanical movement from the Tudor Prince Oysterdate series.

Caliber: Tudor/ETA 2784
Winding: automatic
Frequency: 28,800 vph
Functions: hours, minutes, central seconds and date

The ETA 2784 belongs to the automatic movements Tudor used in this generation of Prince Oysterdate models.

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Timegrapher measurement

During the performed measurement the watch showed the following values:

Rate deviation: +45 seconds per day
Amplitude: 261°
Beat error: 0.1 ms
Lift angle: 52.0°
Frequency: 28,800 vph

The amplitude and beat error are reasonably good to good during this measurement, but the rate deviation of about +45 seconds per day is clearly high. For a buyer seeking more accurate daily timekeeping, regulation and possibly technical maintenance are advised.

A timegrapher reading is always a snapshot in one position and does not guarantee future accuracy or the technical state of the movement.

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Glass

The watch features a convex plexiglass with a cyclops over the date.

The plexiglass shows signs of wear, including fine scratches and superficial marks. Due to the curved profile, the watch has the distinctive look of a vintage Oyster model.

Plexiglass can generally be relatively easily refinished if a smoother appearance is desired.

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Crown

The screw-down crown is equipped with the Rolex crown logo.

This detail fits the period when Tudor used Rolex Oyster case components for various Prince Oysterdate models.

The crown has a knurled outer edge for grip when operating and screwing down.

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Case back

The steel back is screwed down and bears the characteristic engraving around the edge:

ORIGINAL OYSTER CASE BY ROLEX GENEVA

This marking is an interesting historical detail and highlights the close technical relationship between Tudor and Rolex for this generation of watches.

The case back shows clear superficial scratches and signs of wear, appropriate to the age and use of the watch.

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Bracelet and clasp

The watch is fitted with a stainless steel Oyster-style bracelet with three-link rows.

The clasp is a classic steel folding clasp and bears the Rolex crown logo. Inside there are also Rolex markings.

The bracelet and clasp show normal to clear signs of use, including fine scratches and wear on the brushed and polished surfaces.

The current configuration fits a wrist of approximately 19–20 cm.

With vintage bracelets, some slack and stretch between the links can be present due to long-term use.

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Condition

Case: worn vintage condition with scratches and signs of use
Bezel: light to normal signs of wear
Dial: attractive blue with visible aging/use marks
Indices: vintage patina present
Hands: signs of aging and discoloration of luminous material
Plexiglass: signs of use and fine scratches
Crown: Rolex-signed, with signs of use
Back: noticeable superficial scratches
Bracelet: worn with signs of use
Clasp: signs of use and fine scratches
Movement: functioning during measurement
Timekeeping: approx. +45 seconds per day

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Overall condition

A characterful vintage Tudor Prince Oysterdate 90500 in 34 mm, with an attractive deep blue dial and the distinctive Oyster details from this period.

The combination of the Tudor shield, the blue dial, the convex plexiglass with cyclops, the Rolex-signed crown and clasp, and the back engraved with “ORIGINAL OYSTER CASE BY ROLEX GENEVA” gives this watch the classic look for which older Tudor Prince models are known.

The watch is clearly worn and has not hidden its age: there are scratches, signs of aging and patina. The measured rate deviation of +45 seconds per day is also a point of consideration, and regulation or maintenance may be desirable. It is offered as an authentically looking vintage used watch with visible character, rather than as a cosmetically new specimen.