Serendipity at work...given the previous new thread.
Found this interesting
"As was the case with many of its suppliers, Rolex purchased Gay Freres outright in the mid-1960s, from then on turned the operation over to exclusively manufacturing for the mother company, a role that it still continues to perform today."
http://www.vintage-watches-collecti...teel-bracelet-for-memovoxmaster-mariner-1970/
Reference to HC, a Swiss manufacturer who also produced UG signed bracelets. I have fitted one to my Compax and there is at least one on ebay currently.

 

Further searching reveals .... HC was Henry & Cie of Geneve taken over(?) by NSA Novavit SA
http://www.relojes-especiales.com/foros/vintages/nsa-novavit-sa-pulseras-armis-de-calidad-186374/

 

?????

 

Thanks LouS, I did more searching and found this
"Interestingly, in 2001 Rolex bought the bracelet manufacturer Gay Freres, dial manufacturer Beyeler & Cie, and crown manufacturer Boninchi SA, in order to be completely self supplying.... :cheers"
https://www.timekeeperforum.com/forum/threads/rolex-bracelets-a-little-history.13581/: