I’ve never come across anything like that either. Seen various jackets (used to own one, an Irvin B. Foster) made for the PX, essentially the same as the issued jacket, with subtle differences (mine had a two panel back), same label and made on the same production line, but with no USN on the windflap. I suspect this may be another like that, but I’ve never seen one with no fur collar. Does that one have the USN on the windflap? If not, I bet it’s a PX jacket. Unusual to see a paperclip Talon too, they’re usually Conmars or Scovills.