The receiver of your Kar88, Observe the Imperial Crown marking of a govt arsenal like Erfurt, along with the 12 months of manufacturing. The “S” marking implies rechambering for the more recent 7.92x57mmS spitzer cartridge Over a sidenote I've a KAR 91 also with the front sight leafs ground down https://zbigniews988las7.wikinewspaper.com/user