3rd reich advice authentication badge binoculars cupal dagger experts fake or original fallschirmjäger gravity knife general assult badge german air force german helmets germany gravity knife isa jena kriegsabzeichen kriegsmarine luftwaffe m40 helmet minesweeper badge nazi new member introduction opinions paratrooper paratrooper equipment poland real or fake ss rings totenkopf ring totenkopf ring original or fake totenkopf ss authentic u-boot validating ww2 ww2 railway eagle black wwii ww ii