Dear Reibert, this is a hugnarian knifeIt was used by sappeurs, paratroopers at the first period, later was used as a sign of a soldier in duty, exact date not known, around 1949-1960-s
See my thread here,
Magyarországi szúró-vágó fegyver gy
The knife itself is not common these days, I only saw max 10pcs so far, I was told that a few decades ago they demolished most of the stock.
Try the english, it works