Year: 1971
Reference: 27677 2571
Model: Marlin Calendar (Waterproof)
Movement: m25
Complication: Manual Wind, Sweeping Seconds Hand, Calendar (Date)
Special Features: World Time bezel. 25m on dial indicates this model was made for the EU market.
This is part of a pair of sports watch manufactured in 1971. I call this the Storm Trooper as it has a while dial, the counterpart i call the Vader as it has a black dial.