Observation on NASA issued Speedmaster examples, i.e. Wally Schirra Gemini 6

Been doing some research into actual Moonwatches and Omegas in Space watches and I discovered that the National Air and Space Museum website have pretty good pictures on the actual examples that NASA issued to different astronauts during different missions. What's interesting is that many of these Speedmaster examples seem to have been serviced and/or replaced with service parts before being issued or reissued.

For example: here is a picture of the NASA issued "chronograph" to Wally Schirra for use during the Gemini 6 mission, December 1965.



https://airandspace.si.edu/collection-objects/chronograph-schirra-gemini-6/nasm_A19771143000

As the case back shows, it's a 105.003-64. However, I see a "flat end" Chronograph sweep hand, a B2 32 teeth crown, and "Professional Dial". Which makes me wonder how often this Speedmasters were serviced and how long they were used?

It's just an interesting observation and something I haven't read much about.

I guess some folks that have vintage Speedmasters with service parts could always say they have "NASA Mission Correct" examples...lol.

well-known fact...

Understood. But hard to find out this exact information previously without access to the National Air and Space Museum archive photos. For example, on the prior list of Speedmasters that went to the Moon, you can actually now update some of the reference numbers and case manufacturers with these clear photos.