Autavia 2446 Transitional
In 2013 the Autavia 2446/3646 Transitional case was formally identified. As the name implies it shares certain characteristics with both the earlier first execution screw back case and the second. The main distinguishing feature are the lugs which are missing the bevelled edge that is a feature of both 1st and 2nd Autavia screw back cases. In addition to the distinctive lugs, the case features the wider bezel from the 1st execution case. In all examples I have seen, the bezel is the type 2 version with no lume triangle at the 12. Most known examples featured the 3rd execution 2446/3646 dial and straight steel hands. But there have been others such as a 1st execution dial with dauphine hands as well as a 3rd execution 3646 Tachymeter dial. The known serial range is 82xxx to 83xxx.