The Heuer Autavia 3646, 1st execution dial and 2nd execution hands, was manufactured with two bi-directional bezels: one each for 12 hour and 60 minute. We see a few more 60 minute bezels than 12 hour, though I have not been able to discern any pattern, if there is one, as to when one bezel was used versus the other.
The 60 minute bezel is black with silver numerals on the 10s and plots for each minute other than on the 5s, with the exception of 12 o’lock, where there is an inverted luminous triangle.
The 12 hour bezel is black with silver numerals, and an inverted luminous triangle at 12 o’clock. There are no minute marks.