What is the value of a New Hampshire seven dollar bill worth serial a702 April 29 1780?

I was just wondering how much a seven dolar bill from this time and era worth. I have a friend who has some of this money and she was wondering how much it maty be worth she would like to sell it but only at a auction so that this bill can go to the highest bidder. She has a nice collection of these old bills. It would be nice if these were put on the market. If you would like to see a copy of this bill then email me at bigtym107@Yahoo.com