It does indeed look like a MOBAT proof shell. Very cool thing to be given
I don't mean to sound stupid, but what is a proof shell? Thanks.
A proof round is used to test the strength and hence safety of a weapon. It usually has a propellant charge 10-25% higher than the service charge. The projectile is either the normal weight or heavier depending on the requirements of the test and only needs to be a blunt representation.
Your example was made at Royal Ordnance Factory Birtley as part of Lot 2 and the "D?/L/8414/? is the design drawing number.
There are also proof rounds for projectiles, fuzes, primers and propellants but yours is for the weapon.
Regards
TonyE
British Military Smallarms and Ammunition
Collector, Researcher and Pedant
https://sites.google.com/site/britmilammo/
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