Welcome to 60Patrol! Cool! Another European. We don't get many of those here. The 60 series Patrol was pretty rare in those countries, but there were a few.
It's hard to tell the year definitely from your ID numbers, but I would guess they are around 1972 or 1973. That is simply guessing progression of production numbers beyond the ones we have recorded on our Registry.
It would be great if you could post some pictures of them.
Welcome to 60Patrol Krzysiek I've been to your area many times. I work for Mondi AG, based in Vienna, Austria but I work out of the facility in NA. We have numerous plants in Poland (Kutno, Solec, Poznan, Dorohusk, Warszawa plus many others) as well as others throughout the world.
Welcome to this awesome and helpful Patrol community.