Vintage Seiko 'UFO' Automatic Chronograph Watch has been checked, cleaned & had it's movement serviced & regulated by Watchkings H.Q. It is being sold with a 2 year movement warranty.
- Type: Sports
- Movement: Automatic Chronograph 21 Jewels
- Calibre: 6138 movement
- Crystal: Original crystal
- Bezel: Fixed Stainless Steel.
- Dial Colour: Black
- Case: Stainless steel
- Case diameter: 40mm without Crown
- Case thickness: 13mm
- Case Length: 44mm from lug to lug
- Model: 6138-0011
- Bracelet/Strap: Original Seiko Bracelet
6138-0011 originally made in June 1977, serial number 763667.
The SEIKO 6139 and 6138 series are the first fully integrated automatic chronograph in the world featuring column wheel and vertical coupling mechanism.
With this movement, they have set the standard which was followed by the Swiss watch industries 20 years later. The same movement configuration was adopted by Rolex when it made its own in-house movement for Daytona in the year 2000, 30 years after SEIKO released the caliber 6139 and 6138.
The 6138 was the successor of the 6139 automatic chronograph movement but produced in parallel until 1979. The 6138 was technically at least equal to his Swiss counterparts as it had a fully integrated chronograph. There were two versions of the 6138, the 6138A introduced in 1970 had 21 jewels. The 6138B was introduced a bit later with 23 jewels. Both feature a column wheel that regulates the chrono functions, and a vertical clutch mechanism for the engagement. It is still considered to be superior over the mechanically more simple Cam Actuated movements. The movement diameter measures 27,4mm and a height of 7,9mm. The "speed" is 21.600 a/H.
The 6138A and B is a 2 register chronograph, counting up to 30 minutes on one subdial and another 12 hours on the second dial. The second-hand measures up to 1/6th of a second (21600 beats per hours/3600s).
All 6138 movements feature a quick-set day/date indicator and they can be handwound, something that people often miss on most other Seiko 6139 automatic movements.
Used but in Excellent shape. Please inspect the high definition photos carefully to fully appreciate this watch's condition.
Dial & Hand Set in excellent condition.
Case is in excellent condition with no dings or scratches.
Original Seiko Bracelet which will fit a maximum wrist size of 210mm approximately. No returns will be accepted because it doesn't fit, as the information required to make this decision is right here!
We offer a Bracelet resizing service Free of Charge! Simply message me with the required size. All links removed in this process will of course be sent with the watch. If no message is received no alterations will be made & the watch will arrive with the full sized bracelet.
Please take the time to inspect our photos carefully before bidding to assess the watches condition for yourselves.