Shell ID

Hi all, are there any history type gunners know what this might be? It's approx 3 inches across and unusally all steel, it's the baseplate only, about 3mm thick. I'm assuming it's not the bottom of a cartridge as they were brass, more a naval shell type thingy. Found in a Victorian fort on the south coast. Thanks in advance.


Can't get anything from that. Leave it in some coke-cola for an hour, might bring up some details.
Was thinking theres some sort of imprit or markings on the base but cant make it out. Dingerr may have a good idea there.

Maybe for some sort of Naval weapon mounted for field use.
Not sure if that is a shell base.. 2mm thick is a bit thin, and the base does not separate as cleanly as that...

Could be a shrapnel pusher plate..

Needs more photos..
Had a scan of the interwebby and a 12 pounder, 3 inch Lyditte Shell would seem to fit. Made of steel and fits the period. I'll see if they can get some more pics of it.

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