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the terms are interchangeable in this case, although we obviously have no idea how that bezel ended up on your watch. Possibly during a service or possibly by deliberate tampering.
there was a time when a good DON bezel could sell for s much as $5k. People were buying watches, replacing bezels, and flipping them to suckers. Stories about old watches are often apocryphal.
Bottom line, it doesn't matter.
I thought it was B2 Narrow C bezel but after more inspection it looks like it might be a B3 Medium C bezel from 1990/1991-1995. Someone can correct me if I'm wrong. But probably matches up with the service dates. This is referring to the "C" in the word TACHYMETRE
When you hear those numbers before dials, bezels etc people are referring to pages within the book Moonwatch Only which is pretty much the definitive way to have the best bet to ID exactly what kinda of vintage Speedmaster you have—including what parts will have been replaced etc.
One more note to add, I believe service/replacement parts (at least some of them) have a different designation/ref than their production ones. Example is a 145.022-69 case back, the service part number is LL 1450012.
Isn't the "LL" just the mark of the caseback maker?
LL, Louis Lang S.A. Porrentruy, Jura, Switzerland.
Because it was a non runner I made a fair deal where no one was thrilled, but we were both satisfied. If possible I'd like to get more info on the bezel fitted to my watch.
I see people quoting different terms like , "Service bezel" or "Replacement bezel" are those terms meaning the same thing? Are service bezels different to one that came on a later watch from the factory?
I see variants with an accent above tachymeter. Where could I get these details.? Forgive my apparent laziness, but sometimes it's best to get first hand knowledge. Thank you
Here is a very interesting article...
https://speedmaster101.com/base500-bezel-identification/
Have fun!
😁
Here is a very interesting article...
https://speedmaster101.com/base500-bezel-identification/
Have fun!
😁