I did a little searching for you and found a post on rimfirecentral.....( Kispuuska means little gun).
"I actually just very recently corresponded with the fellow who runs the Hungarian Kispuska Training Rifle site on the internet. My rifle has the NV stamping which indicates it was produced in the era from late 1956 to 1959. Apparently, 10,000 were produced in that time period with the " Lampagyar NV Budapest" stamping. By the serial number, mine is from late 1956."
dan