The Seiko 6138-0011 "Yachtman" automatic chronograph, aka the “UFO” - like this all original example for here - has a well-known cult status, hence the nickname “UFO” (although it was advertised by Seiko as the “Yachtman Chronograph”) due to its flying saucer-esque case design.
The UFO features innovative and simple construction, such as a unique lug-less case, very indicative of the 1970s in which it was made, its pushers ( held in place by the movement’s space ring) and crown are well proportioned for the case size.
The oddly numbered 6138 was the successor to the 6139 - the world’s first automatic chronograph - after its introduction in 1969, and the 6138 followed closely behind and was likewise produced by Seiko until 1979. The main differences between the 6138 and 6139 is the 6138 offers hand-winding and featured two chronograph registers versus the sole one on the 6139.
Further, the Seiko 6138 contains subdial registers measuring minutes and hours, whereas the 6139 only measured minutes. Inside, the UFO features a column wheel and vertical coupling – all hallmarks of a serious chronograph movement.
The UFO’s black dial is nicely contrasted with silver subdials and orange/red highlights on the central chronometer hand, dial and the external tachymeter bezel, and its fully integrated chronograph render it truly a landmark design, easily pitting it against the Zenith El Primero.
This Seiko UFO comes with a leather strap, nylon NATO strap, spring bar tool, and Pelican travel case.
1970 Seiko 6138-0011 Yachtman "UFO" Automatic Chronograph
DIAL: Original "water-resist" and Seiko-signed black dial - orange on dial remains vibrant, unlike on most UFO examples. Day/date - with Farsi/Spanish day variants - at 3 o’clock position works nicely, with original hands.
CASE: Original 44mm (w/o crown, 46mm with) x 47mm stainless steel case; matching original caseback. Caseback is signed "waterproof," indicating this UFO - with its 1970 manufacture - as one of Seiko's transitional pieces between proof and water resist.
CRYSTAL: Correct hardlex crystal, no scratches or blemishes.
BAND: This UFO comes with its original stainless-steel bracelet; it also comes with a black nylon NATO strap.
MOVEMENT: Original Seiko 6138 automatic movement, manufactured in November 1970. This 21-jewel movement ticks along at 21,600 bph.
CROWN: Original unsigned stainless steel crown.
CHRONOGRAPH PUSHERS: Chronograph pushers depress with satisfying click, no stick. All chronograph hands reset to 0 as designed.