1921 German Police Marked Luger

Here is a Police Marked German Luger dated 1921 and chambered in 9x19. Unit marked to S.D.L 447 R (with R x'ed out) All numbers are matching that I can see externally except the magazine which is WW2 era marked. Clean pistol, good bore, no import mark and had at one point the added "police safety" to the exposed sear.