It is a vintage *style* PAM, but it's not really a vintage piece. As such, both vintage and modern straps look great on the Fiddy. Personally I think one of Elliot's MP PAV 91 straps:
Or, the MP 10 in bourgogne:
or any strap of that similar burgundy color always look awesome on watches with gold hands.
Micah at vintagerstraps.com has a really nice strap of a similar color, too. I'm sure Savage or Tootall might be able to dig up a similar hide, probably others, too.