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David  I hestitate on bringing this up, but think it's wisest that I do.  A well known dealer is offering items of a photograhic nature that I am confident are altered.  I am conficant for a variety of reasons, but mostly because some of the stamping/production marking combinations on the photographs are not possible.  
I'm not going to name names for a variety of reasons, including most people on this board don't collect the type of photographs and that I have already written explicitly about these types markings and related issues.  However, if anyone is in the market for an expensive 20th century photograph, they can contact me personally.  Thanks