Nice question. Hard to tell as the tachy dial is undocumented.

But typically, across the range rather than Autavia-specific, I would say lume on dial predates lume on markers. Applied numerals is earlier rather than later.

The first Autavias all had hour bezels, didn't they? Maybe the intention was to have additional scales on the dial, until someone realised that multi-scale watches had pretty much gone the way of the dodo at the end of the 1940s (with a brief comeback later with the pulso/tachy combined scale of course) and that this newfangled bezel thing could be used to carry the additional scale rather than having it on the dial. Which would maybe speak for it being around the end of the screw-back case period.

All speculation of course, but there are indicators of the tachy dial being relatively early.