A big part of the hobby for paper money collectors is Fancy serial numbers. Solids, Ladders, Radars and Repeaters just to name a few. Yours is none of the above, and it's in poor condition. It's only a dollar, so if you like it, keep it, but I don't see any premium to be had because of its condition. Here's a link to a website that explains and illustrates different types of Fancy serial numbers.
http://www.coolserialnumbers.com/Fa...Numbers.aspx