There is an UG pamphlet on ebay.
https://www.ebay.co.uk/itm/Universa...a=1&pg=2045573&_trksid=p2045573.c100033.m2042Purchases made through these links may earn this site a commission from the eBay Partner Network
The 2nd page lists the watchs including, at the bottom, 2 Precision watches.

Unfortunately the seller hasn't posted photos of the relevant pages. I am taking up his offer to post more pics.

 

Hmm, could these be a reference to the enigmatic HPC watches?

 

this is the standard booklet, I have a copy, others do as well, the two watches in question are the Triple Calendar moonphase and the Triple Calendar. Sadly no link to HPC, and I have no idea why they use this generic term "precision watch" as the header.