Finnish Army / Civ. Def M/56 radiation slide chart.
Original Finnish radiation exposure rules. Lots of these were made in 1950-1970 period in anticipation of the coming nuclear apocalypse.
Even if these are in Finnish and the unit is röntgens, the disc is very usable should there ever be a situation where such equipment is needed.
Three different versions are available
120mm plastic, some of these have VSS ( civ def stamps, as army discarded most of these as better equipment became available )
160mm plastic, these have the SA stamps
160mm plywood, SA stamps original 1950´s type
All are in nice condition, some storage stains and scratches are possible.
Exentirc piece of equipment.
Perfect gift for " i have all of them " friend
Best available is delivered.