Ken--All the 400 photos I've seen show a straight back receiver. Very popular model, and basically the predecessor of the post-WWII Model 700. However, the photo I have of a Reliance (or Continental) shows the same crescent-notched back as the 500. And it was made from 1900-1935. So I think you're still stuck with W&S as a possible maker for a Damascus gun with that receiver type.