Christ/Orpheus

I wanted to find an image of the 'iron cylinder' with the representation of Christ as Orpheus Bacchicus. (It's mentioned in the quotation from Rahmer I posted here.) I found an online copy of a book called Orpheus - the Fisher: Comparative Studies in Orphic and Early Christian Cult Symbolism by Robert Eisler, published in London in 1921, and it includes an image answering to the description Rahmer gives. Eisler says that the object in question is a 'seal cylinder' and that it is made of hematite, that is iron oxide. This is the engraving that appears in Orpheus - The Fisher:






While this is quite an intriguing object, I've come across suggestions on the web that it is a fake and, at the moment, have no way of knowing whether that's true or not. So... not necessarily authentic but kind of interesting even if it isn't. What would like behind the faking of an artifact like this?