Hello,
Your ISA is original and the maker is currently unknown.
This one is belongs to the Vienna Design family of ISA'a and is referred to as the Semi Hollow Rifle - Raised Hinge Guide variant.
Most are found in this condition with the reverse finish adhering to the surface much better than the obverse.
Here is mine to compare.
Best Regards, fischer
Thank you fischer! That helps a lot
Last edited by kc918; 12-19-2021 at 06:50 AM.
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