Hi GT, I don't recall having seen variations with just 'Interarms' on the spine, apart from the MecGar magazines that were made in Italy for Interarms. Can you post a photo of the marking on the spine?
There were the 'Made in Holland' versions, made by the same company (MFT), but directly for Interarms.
The 'holy grail' are the magazines with both the Mauser banner and the 'Made in Holland' marking
