These pieces were known in Dutch language as 'Lotsverbondenheidspenning', where handed-out to all NSB-party members that had been arrested and resided in captivity during the German attack on the Netherlands (which as surely known, took place from 10 to 14 May 1940 and ended one day later). These plaques - which were awarded to NSB members at a fairly limited scale - were executed in genuine bronze and show stunning detail overall. The medal has a diameter of 4 cms. Rare original NSB medal in top condition!