I bought a Marcel Mouly limited edition lithograph which the certificate states is "sighed". I bought so many pieces from Parkwest over the years that I didn't think to double check the signature. The piece was very dark where a signature goes (bottom right corner). I recently tried to sell it and discovered, unlike the apprisal given me by Parkwest, the piece IS NOT SIGNED. I complained and Parkwest's nasty lawyer told me to F@*lK off. I asked that Parkwest simply give me a signed, numbered replacement but they have ignored me. Parkwest pretty much sell art by marginal artists and for really valuable art, they overcharge many times over.