The following is an inerted 7.9x57 :
The case is non magnetic and appears to be copper washed brass (however; there appears to be little, if any, copper green verdigris, that might confirm a copper wash).
The projectile feels heavy but is non magnetic (also might have been; ‘washed’).
There appears to be a; ‘red lacquer,’ ring around the joint of the projectile and case. Could this indicate a Tropical (Trop.) cartridge?
Alternatively; is the red lacquer ring indicating an origin in Spain, or China?
The primer crimp appears to be different from a typical 7.9x57 crimp. Is this crimp style typical of a particular country, or a particular manufacturer?
Might this crimp indicate an over-pressure test cartridge?
There is no annulus color, or additional stab crimps.
Additionally; no headstamp.
Any help would be greatly appreciated.