I thought to add some photos of a couple of trench art 75x129 cases for the Skoda M1915 mountain gun which I have. The style of the trench art indicates their use by Turkish forces in WW1; I think both support the great work put together by Kornel. The 654 marked case is by Berndorf, the same number appears in the list manufactured at Karlsruhe. Both have Austrian made primers, but the 507 marked case has a M14 and the 654 a M15, supporting the concept of changes in primer forcing a different case number to be allocated.
Well done Kornel, great to have an explanation of these numbers.