Lets put it this way? I am zero expert in this but couldnt it be that:
1. the clasp is from another rolex bracelet? That everything is autentic just put together?
and/or
2. maybe TC is stamped by a watchmaker and that the clasp was clean from the start for example?

 

The clasp is from somewhere else but not sure where. The end links are for a Tudor (likely a sub which uses 380 or later ones the 380B) or a 9315 bracelet for a Rolex 1665.
Rolex bracelets that were used on Tudors before they started using their own shield logo bracelets in the 80s and 90s.
Rolex would not likely let a bracelet leave without a stamp. A ‘C’ code bracelet is from around 1978 while a ‘T’code would be circa 1995 so this is contradicting information. I don’t know if watchmakers would randomly add a stamp to a bracelet but I couldn’t see the purpose.
The 7836 is not widely known to be replicated.
We need more Rolex experts to chime in