[Herb]

John, just a quickie, it is a Simpson, based upon the right frame markings.
According to Harry Jones in his book Luger Variations and also Kenyon in Lugers at Random it is more than likely a 1934 production model. Simpson dropped their familiar Simpson/Suhl marking toward the end of their mfg career in favor of just the gothic S. Noted items of interest--there should be eagle/6 inspectors proofs
on the side plate, extractor, and both rear toggles, I don't see them in your photos. Additionally the 'S' stamping is too far forward, it should be toward the rear of the toggle just in front of the serial # last two. Additionally nearly all parts will have the inspectors stamp, even the grip screws! If it is authentic, it is a hard to find variation and carries a premium price over the 'regular' Simpsons. I posted to this topic earlier but when I came back to check, the post was gone??? Perhaps some of the other guys have some more details for you, nice find!