Found this at the same show I found the 18pdr WWI Solid Shot. I know it's an 81mm of the Brandt design, but other than that, no clue. The "fuze" is solid machined, the fins are either zinc or cadmium plated and the only markings that I can find are on the fuze, a "B" and a little square 180 degrees from it. Info? SWAG's? Thanks, Bruce.