6,5x54R Dutch Mannlicher with headstamp G

Here is a picture with headstamp on the case 6,5x54R Dutch Mannlicher. I don’t have an info which metal supplier was marked with code G. Please, help me to ID this headstamp

65x54R

I thought the letter at 6 o clock only indicated the batch and not the maker?

The letter indicates the metal supplier (who probably made the case as well). AI (Artillerie Inrichtingen) made all the finished cartridges.