never seen one of these original signs (item No 121004934339) but this one looks a bit like repro to me.the back looks to late for an early sign so my opinion is repro.if any one thinks its original id like to know-i would have thought an original would have serious bidders pushing the price right up---David

 I agree with your thoughts David, just to good to be true. The back certainly dose not look correct to me, it should have all the different colours smudged over it?

Regards, Allan.

I have seen the originals (yellow and brown) a few time before. All convex. None flat. I would say this is a repro.