For the record, the OP was asked to post the question in the Classic US forum rather than the Modern US forum where it was originally posted. Is there a way for a user to move a thread rather than repost?
From the picture, I cannot tell if any of the stamps are the right color for a 10 or 10A. Hint, scan
ebay or better yet a good auction site like Siegel Auctions PowerSearch and look for 10 or 10a versus 11 or 11a. After looking at a few dozen examples of each you may be able to see the difference. Or maybe not, since there are so many shades of this set of stamps, it can be hard to categorize which family of shades a particular stamp came from, especially from computer scans.
Good luck!