[b]Hello to all. First post here - a kind member at US Militaria Forums directed me to you. I’m curious, not knowledgeable in the least, about the markings on the base of this shell. Is it possible to determine approximate dating? Why are there 2 lot numbers, exclusive of the one on the primer? For info, the expansion ring is stamped “Lot 1075-28” with the flaming bomb ordnance mark. Thanks much for any replies.