Fake 1931 3d

[Mike Klee 15]

I have recently seen a supposed 1931 3d. It looks really, really good - except that:

• it has reeded edges
  
• the "9" sits too high up and to me appears to be slightly smaller than it should be
  
• the middle piece on the open side of the "3" isn't pointed but looks almost bulbous
  
• the bottom portion of the "3" appears to be "thicker" than it should
  

I am sure that there have been lots of attempts to forge 1931 3d pieces. Has anybody come across this particular one?