I believe the pictures below show a shell case for the 5cm Great 56 gun and I would be grateful for confirmation from the experts on here. Mouth diameter is 50mm and length 461mm. My understanding is that only a prototype(s) of this gun were made so I assume from the markings that the case would be considered experimental. Can anyone explain the meaning of 'L1VI5821' ? Third picture shows the case next to a 5cm Flak 41.
Thanks in anticipation.



Thanks in anticipation.



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