Can anybody help with identifying these three unmarked, and presumably clandestine, 7.62 x 39mm ball rounds? They have no markings other than those shown in the scan.
(left) Brass case with no primer colour. FN possibly?
(centre) Brass case with a nickel primer and a distinctive pale blue paint primer annulus. I seem to recall that this might be Frankford Arsenal?
(right) Grey-green lacquered steel case with no primer annulus.