I found this inert shell decades ago at a garage sale in New Brunswick, Canada and finally got around to cleaning it up. I'm not really well versed in the various marks on it, but I've attached some pictures with the hope that someone on the forum could provide us with some information on it.

It weighs 27.6 lbs and I think it might be WWI era. It is 13.25 inches tall and 4.5 inches in diameter. It also has stamped on the body SF4765U and above the U there is an arrow pointing up. Lower on the shell there is an STS under the T there is a line and then a W. A little lower there is CN. On the bottom it has stamped on it S.E. CO 17.6.18 and above it is 45 HR IX or TX and then NO. Any help would be much appreciated. I can provide more pics if necessary

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  • Hi and welcome! It's pretty hard to make out the markings on the bottom of the shell from that picture. Can you provide a clearer picture, or summarize what you see there? You may find that lighting from the side will put the markings into relief. Part of the marking looks like a date but hard to discern. "17 • ? • 18" – AllInOne Apr 27 at 18:18
  • Thanks Craig. Please edit this additional information into your question. Questions should contain the complete info required an answer the question. Comments are considered ephemeral. I'm not qualified to answer this question but there's enough info here now that I expect someone can and will. – AllInOne Apr 27 at 20:31
  • The location of the find would also be of help. – Boaz Apr 29 at 17:03
  • Going out on a limb, U↑ might either be inspection mark or government property disclaimer (C↑ is definitely Canadian gov property, dunno U↑), 17.6.18 is when it was filled by SF CO. SF in number might be the explosive type like CF is Cordite filled or Full charged shell, SF might be a type too like in modern naval artillery it is Slow fire as opposed to RF or rapid fire. SF CO might be Société Française de Munitions de Issy-les-Moulineaux – NSNoob May 1 at 11:30

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