Erfurt commercial Lugers

[glock30]

Is there such a thing as a Erfurt commercial, the gun bears no proofs on the receiver were there would be normally Erfurt Mil proofs, the barrel is a .30 but does not match, did Erfurt after WWW1 rebarrel WW1, grind of the date and sell them commercially or as in .30? the blueing intergrity is the same ,the weapon bears on current usa inporatation stampings