25 Pr with cut off markings

Hello all,

Wanted to get people’s opinion on this 25 pounder shell that has all of its marks cut out. What does the UB mean? Which manufacturer is RM/C? Does the cut off marks make it a blank?

Thankyou in advance.

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See 76 mm factory code (plus 25 pounder cartridge case) - #12 by tanika and subsequent posts.

Not unusual for previous stamps to be cancelled by ‘barring out’