Flying saucer: the Seiko 6139-7020 Speed-Timer | Adventures in Amateur Watch Fettling
6139-6000 JDM SpeedTimer Sports Proof/Proof from July 1969 – classicseiko
Review - Seiko 5 Sports SpeedTimer Ref. 6139-7020
Introduced in 1969, the Seiko 6139-6000 Speed-Timer was arguably the worlds first automatic chronograph. This example features the rare and… | Instagram