I have a 1930's Heuer Chrono, that looks identical to the Sportex Leonidas (see on Farfo's page below, it is the watch on the left of the fourth row). Does Heuer or some other entity provide any reference or production numbers and the relative dates that provides exact data regarding modelo, year, production etc.?

http://www.farfo.com/antique_watches.html

Thanks for any help

Hanns