What is the value of a 1700 US 2 dollar bill?

Please check that date again and post a new, separate question. The US didn't exist in 1700 and the first $2 bills were issued in 1862.

If you're seeing the date 1776 on the back of the bill, please turn it over and look for the printing date on the bill's front. All $2 bills issued since 1976 have a picture of the signing of the Declaration of Independence on the back, which of course occurred in 1776.