After a few hours of search, I can't identify this shell. I know it's a 75 mm shell, from one of the WW (probably WWI, but can't guarantee it), found in France, but that's about it. Could be from any protagonist. Someone has a lead?
Probably WW2, as the 39 seems to indicate year. A cartridge with the same markings is listed on a retail page here:
...is headstamped SF (Société Française des Munitions de Issy-les-Moulineaux (French Society for Munitions) France) over H 4 39 (December 1939) I . The brass primer is stamped EB 211 39 (1939) .
The only variation is one entry on the primer. The SF headstamp is also listed on a table at here as:
Société Française des Munitions, (Gévelot S. A.), Place Jules Gévelot, 92310 Issy-Les-Moulineaux, France
So your casing seems to be of French manufacture, made in 1939.