Hi.
I haven't seen the show yet but I think I know this watch. A few years back, I ran a little web site called TimeTrafficker which bought and sold 70s era watches, mostly LED, to rationalize my watch addiction. About 2 years ago, I was contacted by a propmaster who explained that they were looking for vintage watches for a soon to be in production Netflix series called Mindhunter set in the 70s. They were extremely nice and asked a few good questions. I wish I still had the email exchange so I could re-read it but I do remember the essential parts of the conversation.
So, yes, I believe the watch worn by Holt McCallany's character Bill Tench is the watch that I sold to them - a nice chunky Hamilton QED II model from around 1977.
Thanks for noticing! I'll have to watch the show now. It seems that both the props people and the casting folks did quite a nice job in making show look visually true to the subject matter that it depicts.
Cheers,
-abe.