Well, I tried to delete that post because it really doesn’t matter any more, but it timed out in the middle of it.
Tim Witt was wanting to gather info on S/N, date of manufacture, and if yours had the newer focusing screen, in order to determine when that change occurred along with the number and date of the last one produced.
The post above yours by Sheperd is like what he was after. It’s still a good read on a great camera!