unknown 100 mm projectile

[William49]

Hello,
today I got these photos from a 100 mm Projectile. I think it could be a Russian type , but I cannot found this projectile in my documents. Who can help?

 

[M8owner]

Perhaps an OF-15 HE for the MT-12 AT gun.

http://www.bocn.co.uk/vbforum/threads/104017-Ammunition-for-Russian-T-12-MT-12-100mm-Antitank-Gun

 

[William49]

Hello M8owner,
the OF-15 also was my first idea. But there is a different distance to the obturating ring (compare with the drawing). At OF-15 this distance is approx. 160 mm, but at the unknown projectile the distance is approx. 120 mm.