Omega Seamaster 366.0884 Automatic Champagne Dial — 1970s — Pre-owned

Vintage tonneau-shaped gold watch with integrated bracelet — Seamaster Automatic Collection

The Omega Seamaster Automatic 366.0884 embodies the watchmaking aesthetic of the 1970s with its gold-tone tonneau/cushion case and nearly integrated metal bracelet. Equipped with a 25-jewel automatic movement, a satin-finished champagne dial, and a distinctive day/date display at 3 o'clock, this Swiss vintage timepiece represents a timeless classic of horological design from that decade.

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Omega Seamaster Automatic 366.0884 – 25 jewels – day and date – gold-tone case – original Omega bracelet

A vintage Omega Seamaster Automatic, reference 366.0884, equipped with a gold-colored case, champagne dial, automatic movement and combined day and date display at 3 o'clock.

This example displays a distinctly 1970s design, with a tonneau/cushion case and an integrated Omega bracelet that creates a sense of continuity. The champagne dial features applied baton hour markers, a central seconds hand, and the inscriptions OMEGA, 25 JEWELS, Seamaster, and AUTOMATIC.

The photos provided extensively document the dial, case, crown, back, bracelet, clasp, wrist circumference and a measurement by timegrapher.

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Basic information

Brand: Omega

Collection: Seamaster

Reference: 366.0884

Estimated year of manufacture: around the mid-1970s

Edition: Automatic, champagne-colored dial, day and date display, and gold/silver-colored bracelet

Movement: Automatic mechanical

Number of stones: 25

Functions: hours, minutes, central seconds, day and date

Gender: Men / Unisex

Origin: Switzerland

Case: Gold-colored case, probably gold-plated or gold-capped

Dial: Champagne / gold color

Time markers: Applied baton index fingers

Glass: Clear synthetic glass / plexiglass

Back: Stainless steel case back with Omega Seamaster medallion

Bracelet: Omega metal bracelet in gold and silver.

Clasp: Omega signature folding clasp

Wrist circumference: In the photo provided, approximately 18 cm

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Important details

Dial: Champagne with horizontal satin texture

Time markers: Applied elongated baton index fingers

Hands: Clock-shaped baton hands with slight inlay

Seconds hand: Thin central hand

Day: Full day indication in abbreviated form at 3 o'clock

Date: Displays the date next to the day at 3 o'clock

Day/date shutter: Rectangular window with raised frame

Timer: Outer minute ring with thin black markers

Logo: Omega symbol applied above the printed OMEGA logo

Inscription below the logo: 25 JEWELS

Lower inscription: Seamaster AUTOMATIC

Dial back: SWISS MADE

Case: Gold-colored tonneau/cushion case

Glasses: Large, smooth, gold-colored glasses

Crown: Ribbed crown

Back: Steel case back with central Seamaster medallion

Bracelet: Omega metal bracelet with wide rectangular links

Clasp: Omega signature folding clasp

Closure markings: STAINLESS STEEL, 1468/012 and visible Omega logo
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Estimated year of manufacture

Based on the reference 366.0884, the shape of the case, the champagne dial, the day/date configuration and the characteristic integrated bracelet style, I estimate the year of manufacture of this example to be around the mid-1970s, roughly between 1974 and 1977.

The wide cushion-shaped case, integrated bracelet, and graphic dial design are highly emblematic of Omega models from this era.

The exact year of production cannot be determined with certainty from the photos provided. To do so, it would be necessary to verify, among other things, the serial number of the movement.
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Housing

The case features a characteristic tonneau/cushion shape that clearly fits into the watch designs of the 1970s.

The case is gold-colored and features wide, flowing segments around the round dial. The bracelet connects almost directly to the case, giving an integrated look.

The detailed photos provided clearly show signs of wear. The gold-tone finish exhibits scratches, wear, and localized discoloration. Wear is also visible around the crown and at the bracelet junctions.
The wide bezel shows superficial scratches and signs of wear. Despite these signs of use, the typical shape of the case is still clearly identifiable.
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Dial

The champagne dial features a fine horizontal satin finish and, together with the gold-colored case, forms a distinctly vintage ensemble.

Below the 12 o'clock position is an applied Omega symbol. Below that are the words OMEGA and 25 JEWELS.

Above 6 o'clock are the famous Seamaster cursive lettering followed by AUTOMATIC. At the very bottom appears SWISS MADE.

The hours are indicated by applied baton markers. A thin black minute track runs around the outer edge.

At 3 o'clock is a large rectangular window displaying the day and date, with a raised frame. The photos show TUE 12.

The dial shows visible signs of age and wear. In several places, there are light stains, discoloration, and fine scuff marks. The hands also show signs of aging in their inlay and finish.

These signs of wear are consistent with the vintage character of the watch and are clearly visible in close-ups.
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Mouvement

Type: Automatic mechanical

Number of stones: 25

Frequency: 28.800 cycles per hour

Functions: hours, minutes, central seconds, day and date

The dial reads 25 JEWELS.

The movement itself is not visible in the provided photos, as the case back has not been removed. Therefore, without additional photos of the movement, it is impossible to state an exact caliber number.
The timegrapher measurement provided confirms a frequency of 28.800 alternations per hour.
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Back

The back consists of a round stainless steel case base.
At the center is the famous Omega Seamaster medallion with the seahorse motif and the text SEAMASTER.
The base is clearly used and shows several superficial scratches and signs of having been opened. Around the outside, signs of wear are also visible.
The back contrasts with the gold-colored case and matches the two-tone aesthetic of the bracelet.
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State

Case: vintage used condition with visible superficial scratches, wear and localized discoloration of the gold color finish.
Glasses: fine scratches and visible signs of use.
Dial: Original champagne appearance with visible signs of aging, small spots and slight discoloration.
Hands: obvious signs of aging and wear; light inlay shows signs of age.
Glass: superficial scratches and visible signs of use.
Crown: ribbed crown with significant signs of use; the Omega logo is not clearly recognizable in the supplied photo of the crown.
Back: Seamaster metal case back with superficial scratches and signs of having been opened.
Movement: automatic mechanical, 25 jewels according to the dial.
Bracelet: Omega metal bracelet with obvious wear on the gold-colored parts.
Clasp: Omega signed folding clasp with marked scratches and signs of wear.
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Bracelet

The watch is equipped with an Omega metal bracelet with wide rectangular links.
The bracelet has a two-tone appearance with silver edges and gold-tone central plates. These gold-tone surfaces show significant wear on several links. In several places, the underlying silver metallic tint is visible.
The clasp also shows normal to visible signs of wear. The Omega symbol is located on the outside.
Inside the clasp, the inscriptions Omega, STAINLESS STEEL and the number 1468/012 are visible.
According to the size chart provided, the bracelet currently fits a wrist of approximately 18 cm.
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Walking measurement

The watch was checked by a timegrapher.
The following values ​​are visible in the provided measurement photo:
Drift: -8 seconds per day
Amplitude: 228°
Beat error: 0,3 ms
Frequency: 28.800 cycles per hour
Lever angle sharpening: 52,0°

The drift shown during this check is -8 seconds per day. The amplitude is 228° and the beat error is 0,3 ms.
For a vintage automatic watch, this is a usable snapshot of its operation. The 228° amplitude isn't exceptionally high, but the watch runs at the displayed measurement with a legible and stable value.
A timegrapher measurement captures a single moment in time. Actual daily performance can vary depending on position, temperature, wearer, and how the watch is wound. Furthermore, this measurement cannot indicate when the watch was last serviced.
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Delivered with

Omega Seamaster Automatic reference 366.0884
Omega metal bracelet
Omega-signed folding clasp, marked 1468/012
The bracelet currently fits a wrist of approximately 18 cm.
An original Omega box, papers, warranty card or extra links are not documented in the photos provided and are therefore not included in the lot.
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Condition

A characteristic vintage Omega Seamaster Automatic, reference 366.0884, with champagne dial, automatic movement and day and date display at 3 o'clock.
Based on the reference and design, the year of manufacture is estimated to be around the mid-1970s, between 1974 and 1977. The large tonneau/cushion case and the almost integrated metal bracelet give the watch the distinctive aesthetic of this period.

Cosmetically, the watch is clearly in vintage, worn condition. Scratches, wear, and discoloration are visible on the gold-colored case and bezel. The gold parts of the bracelet also show significant wear, with the underlying silvery metallic tint showing through at various links. The crystal, case back, and clasp also show signs of use.

The Champagne dial boasts an attractive satin finish and also shows signs of age. The applied baton hour markers, the Omega logo, the 25 JEWELS designation, and the Seamaster inscription are all clearly preserved. The large day and date display at 3 o'clock is a distinctive feature of this version.

The measurement provided by the timegrapher indicates -8 seconds per day, an amplitude of 228° and a beat error of 0,3 ms at 28.800 ticks per hour.

The combination of the typical 1970s case style, champagne dial, day/date function, automatic movement, Seamaster case back and signed Omega bracelet makes this piece a recognizable vintage example of the Omega Seamaster Automatic 366.0884.