In the meantime, in Hong Kong...
While we're still debating the font of the Autavia script in the IDF specimen that will go under the hammer in Geneva soon, Phillips has already announced another auction in Hong Kong (which puzzingly has a lower number than the Geneva though it comes later?).
And guess what - in the very few Heuers they're listing (link here: https://www.phillips.com/auctions/auction/HK080218/filter/artists%3DHeuer) is another IDF Autavia, this time with a very thick font - see for yourself here: https://www.phillips.com/detail/HEUER/HK080218/1009
Quite mysterious to me how can the bracelet upper end that joins the case be so ruined - almost looks like sprayed with white paint? - when the rest is almost mint.
The estimate seems quite optimistic to me, but let's see.