I have acquired a set of Steyr Quick Detachable Sight Mount Rings. On them are these numbers cast as raised letters on the front turn-off mount of 15.00.07.0007 and the rear of 22.07.010.

They are gloss black and whilst I know they are turn-off mounts from a Steyr Mannlicher. I need to know if they are 1", 26mm or 30mm! And what models?

Help!