Unique 2006 Mets tagging

[cbb5]

This is not unique to this year. Set "E" has appeared in past years on several jerseys that I have seen. I am guessing it means "extra". Hernandez came over in a trade and the jersey was most likely made up with an extra blank that the team had for such purposes. I would like to verify with Charlie Samuels somehow, but he is almost impossible to get hold of.
Chris