Caliber 2542? Huh? https://m.ebay.ie/itm/Vintage-Zenit...251647?hash=item2f1923fc3f:g:oxwAAOSwheFazO3xPurchases made through these links may earn this site a commission from the eBay Partner Network
Looks like a 3rd Generation S58 which AFAIK should have a 2542PC. This one contains a 2532PC which does fall into the realm of being "possibly correct". Great thread on the S58: https://omegaforums.net/threads/the-mysterious-zenith-s-58.5532/