Separated at birth: a pair of 6139’s
The 6139A was Seiko’s (and arguably the world’s) first automatic chronograph, released in March (?) 1969 and featuring quickset day/date, …
The 6139A was Seiko’s (and arguably the world’s) first automatic chronograph, released in March (?) 1969 and featuring quickset day/date, …
Adventures in Amateur Watch Fettling 