Mike---that item is listed in SCD's Standard Catalog as a "1980 Topps( ?) Sticker Prototype". It lists 4 other two player panels as well. This is the only one I have or have seen personally. I assume the ( ?) means Bob Lemke was not positive it was a Topps item. The Wills pictured is obviously not Maury. But The Topps 1973 reprint set of 8 has 3 incorrectly identified players, so Topps is know to have made mistakes .
Here are 2 other items, one which has a comical number of errors, that may or may not really be Topps items. The Mantle is listed under Topps in SCD, but not the Puffy Stickers
