Here is a quote from me regarding this "Sometimes I think they have too many variants, I might never be able to make up my mind.".
It is from this thread which has a discussion regarding the snap-on case backs:
https://www.rolexforums.com/showthread.php?t=625737
Anyway... I forget there are two other models which fit the description approximately, the 685 and 687.
Oh, I still haven't pulled the trigger myself.