Just random thoughts on this:
1. Do we have knowledge of Wagner using a stamp at any time?
2. Does this look like a signature generated when Wagner was 70 years old ?
3. If this is a stamp why would this item be stamped and not signed if it is a receipt? If presented to him in person why stamp it? If this is a forged signature with a stamp the forger went to a lot of trouble to have a stamp made , and for what purpose other than to create more forgeries, yet I can find no mention anywhere dealing with Wagner forgeries being a stamped type of forgery.
4. There are areas of variable ink density, as well as area of starts and stops of ink on some of the letters on the signature. Also areas of overlap seem to be present on the signature.
5. I do not know Wagner's signature well enough to authenticate or offer an opinion. I know his variations and certainly this seems to follow a variation pattern.
Maybe this guy got a good deal and that is the truth of it, or maybe he got a stamp . I believe without seeing the piece in person and examining in person and up close this could be a hard one to decide on in my opinion.
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