Now I’m curious too; Lord knows I have enough of their stuff…I always assumed they made them in house. But if not, and I had to guess, I’d say they’re made by Noveske; V7’s founder Joel Allen, started Noveske with John Noveske, then left to start his own company (companies actually) after John’s untimely death.
Edit: Just saw you asked who makes the blank…my bad, I can’t brain today, I have the dumb. Will be better after coffee! LoL. Pac-Nor makes Noveske’s blanks IIRC, wouldn’t be surprised if they also make blanks for V7.
still looking…. May call Monday if I can’t figures it out.