hey there. just a disclaimer before i get into it. im very new to this so sorry if i dont provide enough information for you to help me.
i found two cartridges in my yard in poland. one if them is 53mm long and is rimmed. the rim appears to be about 14mm in diameter. i thought it could be a 7.65x53mmR but im not sure. it has a “913” on the back
the other one is 50mm long and there is “1906” on the back along with what appears to be a “GR” logo. the rim is 14mm as well.
i have no clue if these are german or not. any help is appreciated.