You could get a Revue Thommen Airspeed Classic Chronograph Automatic - that has a count-down bezel and the older version, used examples of which surface occasionally, has the Lemania 5100.
Lemania 5100 version:-
Series 2 Valjoux 7750 version (you can get this new from Watchintime for 545 pounds)
Lemania 5100 version:-

Series 2 Valjoux 7750 version (you can get this new from Watchintime for 545 pounds)
