Had this one turn up the other day and is what I believe to be a French 75mm QF shell case am I correct in this summation it is pictured next to a No.2 2Pdr with a 303 cartridge for scale. D E C ? meaning
I gather the 18 is the year it also has a very slight taper starting @3" from the case mouth I.D 75mm OAL 347mm Cost $40/Au which I think was a steal I am leaving the coating on it as its not to bad and getting it off will ruin what patina is underneath. Measurements are approximate as I just used a 300mm ruler.