In my experience,
nice early 60’s stainless steel Seamaster 321s can go for about $4.5k and up. You can pick up
nice gold filled versions for $3k and sometimes less.
Even
mint gold filled ones with matching mint BOR bracelets have a hard time topping $4.5k; really
mint stainless steel ones can top $6k without a bracelet.
The hardest thing about these watches is the dial — very hard to find them with dials as nice as yours.
I can’t really speak to 861 Seamasters because I haven’t spent much time looking at/for them. Regarding the one you’ve posted, the dial and hands are quite nice. But the case and pushers look a little tired. There’s no movement shot, which is important to valuing the watch, but a loose movement isn’t a positive sign — I’d have that taken care of immediately.
I assume it needs service; my watchmaker charges $675 to service most vintage chronographs. Good luck with that.
Get it fixed and then enjoy the hell out of it. It’s got a great face.
This is my favorite gold filled 321 Seamaster:
This was $3.4k with the bracelet. Roughly, February 1968 production.