Does anyone know of a good site or reference for differentiating the #'s 1-9 to #'s 11-15? The colors are difficult to differentiate with shades. Also, I certainly am not an expert with the types of paper. Were the dies the same with these issues? Forgeries may be another area to look but fairly confident that these are legit but will compare as well. Lastly, I will send to Vincent Graves Greene if necessary.
The ones I have are below: