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Hi, sorry for the late reply...
Red triangle is ofter seen marking on Czech(oslovak) ammo, but in this case I do not think it is a Czech military marking.
Czechoslovakia did not use the T-12 gun. It was, however used ba the Soviet forces "stationed" in Czechoslovakia from 1968 to 1991.
Hungary did use this weapon, my manual does not show training rounds.
The wooden mockup looks a bit pointy and unbeaten.
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