Considering how many clones there are out there and how easy it would be to mark one with the RM logo, I'm surprised there isn't a counterfeit industry for these. With the insane prices they fetch I'd be surprised if somebody hadn't thought of it
Funny you should mention it but it was something that was suggested some years ago on British Blades. Huge controversy about these fakes going around until the bloke who had 'outed' the fakes was then outed as having photoshopped the pictures. Folk are odd!!