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Unidentified shell case

Hello everyone, can anyone tell me if this shell case has been cut down? and what country does this shell case originate from? Its diameter is 8.5cm and is about 13cm tall, thank you.

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It is an Austro-Hungarian mountain gun case (75 x 129R) so not cut down made by Csepel Arsenal in Budapest, Hungary.
7.5cm Model 1915. The 33M may be a modification to the usual Skoda gun ? Used in both wars by many countries.
The monogram at the top is AH for Csepel Allamy Hadianyaggyar ( State Ordnance Factory).
It was separate loaded so charge could be adjusted.
 
The 33M may be a modification to the usual Skoda gun ? Used in both wars by many countries.
The /33M modification refers to the type of primer screw used, not to any modification to the gun. /33M cases and primers are not backwards compatible with original casings.
 
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