I think it's from mid 70s or so, I've had it since new and recently decided to see if it still worked. Putting a battery in it was interesting, the battery sits in a small "hole" and the back holds it in place. I guess it's a bit small for a man's watch by today's standards (29mm x 28mm wide, 13mm tall with battery bump). Not sure what the model number is. Right now it's on a green nato, just had one handy.
Sent from my SM-T800 using Tapatalk