75mm Field Gun Shell - Marking Identification Help - General

Hello everyone, I’m hoping to get a bit of help identifying some headstamp markings which i just cant seem to make any sense of. From what I understand: 75 DEC = (In French) 75mm Canone de Campagne (Or in English, 75mm Field gun). I suspect that PX is the makers mark, however my research has only yielded PX as “Unknown Factory, France” I imagine that “D.240L.15.D” implies some sort of ‘Lot number’ and date but cant make sense of it (maybe 1915?). Similarly, i have no idea what the ‘T’ and ‘a

Trying to identify shell case markings - General Ammunition Discussion - International Ammunition Association Web Forum

75mm Field Gun Shell - Marking Identification Help - General Ammunition Discussion - International Ammunition Association Web Forum

75mm Field Gun Shell - Marking Identification Help - General Ammunition Discussion - International Ammunition Association Web Forum

I Have A French Shell From WW1 But I Don't Know When It's I, 54% OFF

75mm Field Gun Shell - Marking Identification Help - General Ammunition Discussion - International Ammunition Association Web Forum

75mm Field Gun Shell - Marking Identification Help - General Ammunition Discussion - International Ammunition Association Web Forum

Can anyone tell me what the markings on the bottom of this shell

Trench Art Artillery Shell Casing Vase Repoussed WWI Era 9.5”

Well made Brass Polte Magdeburg 1915 Trench Art shell, York and

Can anyone help identify where this shell casing is from

military - What kind of rifle used this shell case? - History Stack Exchange