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The dial is marked Seikomatic Weekdater, WATER 30 PROOF, and DIASHOCK 33 JEWELS, with the small vintage Seiko AD star dial marking.
This configuration is associated with the early Seikomatic Weekdater J13080, introduced in the early 1960s and powered by Seiko’s 33-jewel caliber 400 automatic movement.
The watch is running properly, and the day/date functions operate correctly.
Details
- Brand: Seiko
- Model: Seikomatic Weekdater
- Likely reference: J13080
- Movement: Mechanical automatic
- Caliber family: Seiko 400
- Jewels: 33
- Dial: Silver sunburst
- Date window: 3 o’clock
- Full weekday display: 6 o’clock
- Case: Stainless steel
- Approximate period: 1963–1964
- Country: Japan
- Strap: Brown replacement leather
- Running properly
The watch retains an attractive vintage appearance. There are scratches and age-related wear to the case and crystal, along with some small marks/patina on the dial consistent with a watch approximately 60 years old.
The original “Water 30 Proof” marking is historical only. The watch has not been pressure tested and no current water-resistance guarantee is offered.
Service history is unknown.
Photographs show the actual watch being offered and form an important part of the description.
