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Welcome here Ares!
I doubt it is a 105mm (likelier 100mm). What is the exact case length?
Made in the USSR (Orsk Mechanical Factory) in 1966.
Why is Ares’ post hidden now?
There was nothing wrong with it.
Ok, what is the case length?
Or just give us a side view.
Ok, no need to wait. This is the 100mm case for the BS-3 field gun, KS-19 AA gun and D-10 tank gun.
Wow! Amazed. 👍 Thx!
Did you figure it out from the headstamps?
What do they mean?
The side view of the case with your 105mm-info was enough to ID the caliber.
The headstamp is telling the factory code #257 (at 3h pos.) and the 66 (at 9h pos.) is the year.
Nothing special in that.
Thanks for your kind help, much appreciated!