Fantastic! I have not seen a new dual numbered mount like this surface in nearly two years. A new one to add to the data study. From the study, that mount was most likely mated to an ac 44 "d" or "e" block rifle. I especially like the leather eye cup. I have only seen one other like it and there was much discussion on whether it was original or postwar. I'm leaning towards war period myself. Great find! Hang on to that one. Thanks for sharing.