Hallmarks on 1930s-40s Mourgeon and Arthus Bertrand badges

[Castagain]

Hello all, this is my first post on the Forum.  I am a WW2 para insignia collector, and I'd like to understand how Mourgeon and Arthus Bertrand marked their badges and insignia in the time period 1937-45.  I'm hunting for some of the pre-war parachute unit insignia (Section de Parachutistes, 601e GIA, 602e GIA) made by these two companies.  Any advice you can provide on these insignia would be much appreciated.

Regards, Donovan