What is the value of a US 2 dollar bill with Joseph Barr's signature?

Please check your bill again and post a new, separate question. Barr's signature only appeared on series 1963 B $1 bills.

Even though Barr served as Treasury Secretary for only a month or so at the end of the Johnson administration, $1 bills with his signature continued to be printed for a long time afterwards. The final total was over a half-billion so they're hardly rare. Many sellers on eBay are under the mistaken impression that these bills are scarce - or are trying to play off others' lack of knowledge - and are attempting to charge highly inflated prices.