I bought this 75x277R case off someone in the UK who bought it at a Flea Market in France. However, this headstamp does not look French to me.
The case is brass, it is fitted with the standard 33mm screw-in primer with three semi-circular tool slots that is found on cases from all over Europe
I have never seen a headstamp like this before. I would be grateful if anyone could tell me the Country / Factory / year.
EDIT: I have just found that “EP” Stands for Ecole Pyrotechnique, Antwerp, Belgium. So could this be made at EP Antwerp, lot 33 of 1913?