I used photoshop to try and enhance the image, 
but you know what? the resolution sucks and did 
not give me enough information to estimate what 
the number really looks like. it's too bad we 
can't enhance images like they do in the movies, 
wouldn't that be cool? *recalls zoolander and the 
photos of katinka *
   someone had said they thought it was A5, I 
think that is the best guess you can get. 
otherwise, I think you just really need to get 
through to that seller. perhaps if you know a 
deputy service who has dealt with the seller, 
they can email them directly to ask. best of luck.

/Mina