All:

Reviewing the excellent thread below, regarding the 2446C Autavias -- http://chronocentric.com/forums/heuer/index.cgi?page=1;md=read;id=54564 -- and also reviewing the relevant area of OnTheDash -- http://www.onthedash.com/Guide/_Chronographs/62.Autavia/b.Manual--Snap-Back_Case/, as well as the Autavia Reference Table, I come to the following conclusions:

1. There were only two executions of black dials used in the 2446C Autavias.
2. The first execution of the dial had applied steel markers, with no inserts, and no red accents on the dial. Please see the upper photo, shown below. [Hands that went with this dial were steel with luminous inserts.]
3. The second execution of the dial had applied steel markers, with black inserts, and the dial also had red accents (hash marks placed at each hour marker. Please see the two lower photos, shown below. [Hands that went with this dial were steel with luminous inserts (distal) and black inserts (proximal).
4. I believe that there was no “intermediate” dial, between these two (i.e., as soon as they added the black inserts to the markers, they added the red accents to the dial . . . and there is no such thing as a dial that has black inserts in the markers but no red accents on the dial).
5. Finally, there were no ridged markers used on these dials . . . we have simple blocks, and blocks with inserts, but no ridges.