If the serial number were something like 90000000, 90909090, or 90000009, I'd keep it, but with that being said, I'd recommend spending it.
Nope. It's one of those "close, but no cigar" serial numbers. If the first 9 were a zero, then we would have a much different answer, but alas, it is not.
I hate piling on, but generally if you have to ask, chances are it’s not worth more than face value. This website has examples of fancy serial numbers to look for. http://coolserialnumbers.com/FancySerialNumbers.aspx