Yugoslav numerical code #22 ID on 76mm case

Back to the old subject of numerical codes on Yugoslav ammunition as used from 1947 to 1956 (as per observed specimen and excluding the civil war time 1994-1995).

Here a new code which I did not see before. It is applied to a 76mm field gun case (Soviet ZIS-3).
The unusual thing here is the code #22 dated 1950.

Anybody with an opinion on this one?
Or are any other Yugoslav cases known with code #22?
We are not speaking of Romania, Bulgaria, Hungary or China.

Source: internet.

76mm RU_Yugo (1)