Good question Ron, I've often wondered this too.
Perhaps some of the Haslinger/Bonhams attendees can verify what was on the early NOS pieces.

Stewart

: Hi Experts,

: Enjoying a nice Merlot red wine, and watching athletics on BBC, I
: used a dull moment for the next question. Having various
: early/mid sixties Autavia and Carrera, I was wondering whether
: it is correct to fit them with a buckle with Heuer logo. Do not
: misunderstand me, I love them, and have them on most of my
: Heuers. But for reasons of total authenticity, genuinity, did
: they already have them then, and if yes, where they identical to
: the ones which you can buy now?Or maybe with a smaller size
: logo? Or did they come with a shieldless buckle as they were
: introduced later?

: I checked all the catalogues on the site, but never see the strap
: and buckle.Read about corfam straps, so am also wondering now in
: how far the popular perforated version is authentic on them.

: Anybody out there who has an early Autavia or Carrera of which it
: is sure that it is 100% authentic??? Ordoesn't, but just
: knows>

: Have a nice weekend!

: Ron