French 12.7x99


#1

What’s the meaning of “I”?


#2

Manufacturer of the metal : I = Société de Métallurgie Franco-Belge, à Issy les Moulineaux.


#3

Municion.org has a similar headstamp (SF-1-82 12.7 S) with “S” instead of “I” and the caption also says “Societé Française des Munitions, de Issy les Moulineaux.” Is that right?


#4

Manufacturer of the metal : S = Compagnie Française des Métaux Sérifontaine.
Also exist without indication of the manufacturer of metal.