Hey everyone. I have a good friend of mine that recently purchased a mint john deere horizontal porcelain sign (its the sign on top in Amistadi's guide with the 4 legged deer). Anyway the only odd thing about the sign is that it has a yellow back (similar to the color of the yellow on the front of the sign). Its marked Burdick...on the lower right front corner of the sign. I have heard there are reproductions of this sign out there but have not seen one yet...is there a definite way to tell the repro from the real mccoy? Is the original marked Burdick on the lower right corner? Any help would be great...I do not have any pictures to post of his sign...may have them a in a few days.