Strange markings on my lugers "loaded indicator"

[olearyjms2]

Thanks for the input chaps. Further research ive done indicated that the bolt assembly may have been replaced when the pistol was overhauled in 1920. As I understand it, all lugers that were allowed to be kept by germany after
WW1 were date stamped 1920 and re-conditioned. Pics attached. The SS jacket and luger pic may not be historicly acurate, but it looks great