Authenticity of JB Champion signed flat link bracelet

Good morning! I've been looking for info on this bracelet but am having trouble wadeing through the NASA style threads and finding anything relevant.

Is this bracelet authentic? I have no reason to doubt the seller who has 100% feedback. I have no association with the seller.

https://www.ebay.com/itm/185189828738

To the reason I ask....I just traded for a 145.018 Seamaster 861 chronograph and it came with what appears to be the same bracelet. Initially I was dismayed to see JB Champion on the clasp instead of the expected Omega markings.

After finding the ebay listing, I'm encouraged and curious. My bracelet has 48 end pieces and is marked 2 - 9 on the clasp which makes sense to me as February 1969.

Encouraged, but understanding sellers can be wrong and odd things happened. Can anyone help with info?

I am not an expert and just want to tell that for me is a great diference betwen the written from inside the clasp from the above pictures. In the second pictures for me the written look very "clear" and "thin" . In the original post for me do not look ok but looking forward for the opinions of the experts.

Found another example

https://www.chronocentric.com/forums/chronotrader/index.cgi?md=read;id=71225