Last weekend, this remarkable large type luminous disk was sold on eBay for $400. This is the bridge marker type which is mentioned in my luminous disks article, but I didn’t have any good pictures of it until now. The seller was so kind to let me use his photos. He sold just one disk with the felt bag, but the metal box is very interesting because it solves the TYPE I vs. TYPE III mystery. Apparently, this type of disks belongs in the TYPE III-marked box, which has diagonal dividers inside (allowing for larger, but fewer disks). The TYPE 1 box has the smaller square dividers for the disks that were worn on helmets (mostly). The disk has a clip like the smaller disks for attaching it to the helmet net, the uniform or webbing, and two prongs with holes for nails. It is marked “USRC UNDARK 22m-TTR58 4-45 POSION INSIDE”. This was made April 1945.