[Mr. Zipper]

I don't believe there are many forged Cobb checks, however, you need to be wary of photocopies in framed displays. I have heard of people being duped by this as it is very difficult to tell it's a copy when under glass.

Also, be aware that some were filled out in someone elses hand (but signed by Cobb). There is definately a price gap between all in Cobb's hand vs just the signature. From what I have seen, the checks filled out by his wife are pretty obvious.

Also, the green ink does drive a premium over black or blue.