Avional is Avion for airplane and al for aluminum, to save on brass this type of case was used for the Patr 03,41 and very limited GP11.
Production went on till shortly after WWII.
Thanks,
Guisan. 
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Fight to your last cartridge, then fight with your bayonets.
No surrender. Fight to the death.
--Gen. Henri Guisan, Switzerland, July '40
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