Usually here in the USA when you run across a French made 75 casing (75x350 87rim) its the DE C marked type. I've never seen one like this and couldn't find any other photos posted on BOCN of this type.
Maybe all early French production looked like this? Has a slightly grooved (Bofors style) base - wonder if that had any purpose.

Maybe all early French production looked like this? Has a slightly grooved (Bofors style) base - wonder if that had any purpose.
