I found the projectile on the left recently. I thought it was a French Mle 1910 armor piercing round for the French 75mm when I bought it. It is shown next to my Polish made Mle 1910 projectile, so they are not the same. The fuse thread is not the same either. The outside dimension of the driving band is the same as the Mle 1910 and my other 75mm US projectiles. The driving band is not as wide as the Mle 1910 or other US 75mm projectiles. This has to be made for the French 75mm and not any 3 inch gun variety - I believe. However, I have never seen a US AP projectile for the French 75mm. It obviously has a crimping groove, and there are no remaining markings that I can find. I would greatly appreciate your input.