Checked mine. The markings are identical to those on the bayonets of Barry and Len. It was found in an abandoned house with original frog and early black and tan SS portepee with runes on the stem. The portepee still has the cloth tag, marked 431/35. As I recall, the one on eBay several years ago did not sell and I haven't seen it since. The one Steven C. posted is likely the one I saw on eBay.