The Letov LF-109 Pionýr is a training glider that was developedin the former Czecholsovakia in 1950. As of 2021, only two of the type remain airworthy.

I have been puzzling on this unmarked aircraft, but I cannot find more that this might be OK-3250, that might have c/n 167. If this is correct the aircraft was already withdrawn from use in 1968. But much is uncertain as there are just a few internet sources on these old Czech gliders.