two unknown formerly French 75DEC shell casings

[Oldman56]

Years ago, I bought on the fleamarket at Liege two, for me unknown shell casings
Both are shortened, formerly French shells casings for their canon 75DEC.
Their sizes are 75x280R, the original French 75DEC shell casing is 75x350R., and they have (I think) Cyrillic marks on the base.
They are shortened at the top and the neck length is about 35mm., the original French 75DEC shell casing has a neck length of 45mm.
The rim at the base of the shell casing is thinckened up with an extra ring soldered.
For details, see my pictures.
My question is: from witch country and gun are these shell casings come from?
What's the story behind these changes?
Thank you.

 

[Gspragge]

Years ago, I bought on the fleamarket at Liege two, for me unknown shell casings
Both are shortened, formerly French shells casings for their canon 75DEC.
Their sizes are 75x280R, the original French 75DEC shell casing is 75x350R., and they have (I think) Cyrillic marks on the base.
They are shortened at the top and the neck length is about 35mm., the original French 75DEC shell casing has a neck length of 45mm.
The rim at the base of the shell casing is thinckened up with an extra ring soldered.
For details, see my pictures.
My question is: from witch country and gun are these shell casings come from?
What's the story behind these changes?
Thank you.

These have been modified and supplied to the Belgians in ww1. They were altered to fit the Belgian 75mm field guns.
I have had one in the past.

 

[Hoeksel]

Those cases are adapted by Bulgaria. They have lead in the bottom rim and a Bulgarian primer. Should measure 75x282DR87. Pretty common in Europe.