We shall see then, now you'll be looking closer. Anyway, I'll be here...
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That looks like it is an unfilled mortar shell body taken off the line before filling. The stamped number is the "Unfilled mark" showing who and when the shell body was made. The shell would have been plugged with plastic bungs to protect the threads and keep the inner body clean and gone to a separate filling plant to be filled and fuzed. The body would then have been stencilled up with the filled details in yellow. Another good tell-tail to look for on filled shell are the circular inspection stamps, again in yellow paint..
Mortar fuzes are interesting and harder to design than artillery ones as there is less energy available to arm them. Smooth bore shells also do not spin and therefore do not have the option of using centrifugal bolts in the unlocking mechanism. This is why a lot of them have pins etc. that have to be removed before firing..
It has yellow plastic bungs for each end.
Well, I had a massive brain fart, it wasn't a 105, it was a 155. Painted right on it too. So don't need the casing. Looks to have been repainted but is still nice. Weighs a lot. This is a floor sitter.
https://www.milsurps.com/images/impo.../7nWXSzK-1.jpg
https://www.milsurps.com/images/impo.../sCgISsu-1.jpg
https://www.milsurps.com/images/impo.../aYnyH5Y-1.jpg
https://www.milsurps.com/images/impo.../pl2OpNK-1.jpg
I had one years ago that had been a base ejecting smoke producer...light green paint. Mostly rust fur though, had to clean it end to end and it had a time fuze of course. I kept it for a while but a 100lb bullet uses space. I gave it away before moving back to BC from Alberta... Good thing there's no casing for these. They're the bags only and igniter thing...nice example.