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re the caliber marking..
Does it say 'M 1' after the .30/25 ?

as in;
.30/25 M 1

I had to enlarge the pic and get rid of the flash in the pic to see it better but that's what I see.


So maybe a way of saying it's the 30-06 M1 service rifle cartridge necked to 25cal.

A 25-06 as DerAmi says.

Wouldn't a reference to the 'M1' (rifle?) make the caliber marking at least as late as 1937 when real production of that rifle began?
Kind of an odd way of marking the caliber if it is in fact a 25-06,,but maybe the customer had thing for the M1.