: So Jeff, I was reading some more on Jo Siffert and read that he was
: supplementing his income by selling these Heuer watches to his
: Since as you say my Autavia was probably sold in local Swiss
: market, it is also probable that Jo Siffert sold this one... :)
: How can I research the hand engraved case number?
Jo Siffert sold a mere handful compared to other distributors in Switzerland, so it's not really that probable. In fact, as he was not an authorised distributor in the same sort of way, the watches he sold may not have had the Cuanillon marking. It's vastly more likely that your watch was sold by a jeweller or watchseller than by Siffert, I'm afraid.