alphahands research is focused on a specific Heuer Autavia 3646 – the screwback Heuer 3646 with 1st Execution dial and 2nd Execution hands (with either a 30 minute or 45 minute recorder), produced in approximately 1962-64 (the Autavia was first introduced in 1962).
If there is one place to go in order to read all about Heuer, including history, references, production dates…the best place is OnTheDash. OnTheDash contains sections on all Heuer Autavia, but also drills into the 60s screwbacks, including the 2-register 3646.
My work started specific to the first execution dial and second execution hands with pointed lume, with either the 30 or 45 minute register, but I have also added in the 3646 thin rectangular lume 2nd execution hand.