Hi,
I thinking of purchasing an early Autavia, manual wind, screw down caseback. Were all of these early autavias cases marked with the model / reference numbers between the lugs or was it quite common for the cases not to be marked. Should the crown carry the Heuer logo or again was it common for the crowns to be unmarked.

Any tell tale signs I should look out for to try and spot the fakes?

Thanks to anyone who can assist.

Gary