1970's Heuer Bracelet Help Requested

Hello, OF Sisters and Brothers and thanks for your help!

An old friend, knowing of my hobbies, asked me to help him with a watch that was his son-in-law's family heirloom, a well-worn Heuer Daytona (with extra cheese!).
My friend said that it needed the bracelet reattached and please give him some service advice as his son-in-law would like to wear the watch.

However, the watch as it turns out, has an integrated bracelet and is totally missing the center hinged part of the clasp.

Please, can anyone help in identifying the missing piece I need, the middle piece of the tri-fold clasp? There are no identifying markers or numbers on the clasp, just on the watch.
I was hoping to find the part instead of searching for a donor.

The watch is a latter '70's Daytona that has been rode hard but looks like it is as tough as a tank (a well-rounded, over-polished tank).

The watch:


The clasp (as it were):
Again, thank you.

This is a question rather than an answer. I'm curious to know if Tag services these older models, and if they did, would they have parts for the bracelet? I ask only because it might be the easiest way to source it.

I've also noticed a seller on ebay who specializes in Heuer parts. Maybe worth reaching out to her and seeing if she can source one for you.
The user name is: watchgirl001

good luck!

If they are simply trying to get the watch to the point where it's wearable then it can't be too hard to find an off-brand clasp piece or pieces of the correct size to use and then slowly hunt for originals.