It is a low serial number for that block of notes, however, it was not the 66th note printed. The 66th note printed (I believe, not an expert by any means) would have an A in place of the G, then another 66th note for the B group, and so on until the G group was printed.
If it's going to be sold, you should get significantly more than face value but I have no idea how much, especially considering the condition.
The target market would be collectors of "fancy serial numbers" and you may get block collectors interested since it is the 66th note for that block.
The best bet would be ebay, but get online and contact some paper money dealers about it.
Pictures would be most welcome.