Would my guess be correct that the below is from WWI? This was dug up in Poland in an old battlefield along with other cartridges dated from WWI. Difference is that this is actually a live round, and seems to dinky to have been intended for military use.
Also, the head stamp says RWS NAGANT RUSSE. RWS is German if I am correct, but RUSSE is in French. ??? Who would have used this? Germany? I thought only the Russians used the Nagant revolver that this ammo is for, but seems unlikely that either Germany or France would be supplying ammo to the Russians.