Another interesting selection of rounds,Steve,I'm glad that we're gradually
coming down to my very limited knowledge level.There's not much I can add to what everyone else has said,with your first round the crowned M
says it all really.If,as Tony suggests it may well be,the second one is a special purpose combination for sinking floating mines,it might be a very rare thing to find these days.The third one,I seem to see quite a few of these,I wonder if lots of them didn't actually make it to Japan.They were made here,as has already been said,by the Elswick Ordnance Company,and were for the Japanese Boat Gun,sometimes called the 2 1/2
pdr Hotchkiss.