Hello Ian,
I'm going to assume you are asking what is the correct JB Champion bracelet for the era as worn by the Gemini and Apollo astronauts, correct?
The one most often seen worn by the astronauts is the one pictured above by Pahawi. The bracelets worn by the astronauts had both the straight and curved end pieces. My research regarding the JB Champion bracelet concludes that the straight end piece was seen more often but the curved end piece brings a bit of a premium when sold today. That is because one of the most iconic images of the JB bracelet is that of Dick Gordon strapping on his Snoopy hat wearing the JB with curved end pieces.
Honestly the best place to find the bracelet is on ebay and they show up quite often, both straight and curved. Most are sold used but some are sold new and asking prices are crazy high. I think that a fair price has ranged from $275-$400, again with the curved ends being on the higher end. Unless you have the funds and want a new bracelet buying a used one is the way to go. I know it's tough to swallow seeing the bracelet in the original packaging for $6.95 commanding hundreds of dollars but that's what happens when astronauts start wearing them.
What are they like you ask? I think the JB on the Speedmaster is the most comfortable bracelet I have ever worn. I wear my Speedmaster almost exclusively on the JB bracelet now. I put on the 1450 or 1479 and the next day it's back of the JB. Once you get a knack for putting it on and working the clasp it wicked simple to put on. The retro 60's look is stunning in my opinion. If you enjoy the Speedmaster for its NASA history you will really love it once you add the JB Champion to it. There is nothing like looking at images online and knowing you are wearing the exact same set up.
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