timesofplenty
·Photo above taken May 20, 1969 the Apollo 11 prime crew at Launch Complex LC39a with their Saturn V launch vehicle rolled out...
Note Neil Armstrong wearing a NASA-issued Speedmaster and Michael Collins wearing his personal Rolex Turn-O'Graph pilot watch.
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Of the very first astronaut watches were the bespoke military-inspired 24 hours dial LeCoultre watches, which came on two types of bracelets.
Here's astronaut chief Donald "Deke" Slayton with what looks like a two-part bracelet with a metal part and a part with black leather insert ?
Photo: NASA
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This one...might be JB Champion also but can't say for sure from this picture.
This type of combination was made by many companies: Lenox, Stonewall, JB Champion, Baldwin, and others.
I'm leaning toward JB tho.