What is the value of a 1975 US 2 dollar bill?

The U.S. did not print any $2 bills with that date.

All green-seal $2 bills dated 1976 and later are worth face value only, if found in change. There weren't any $2 bills printed in 1975. The nearest date is 1976. These are worth face value only unless they're uncirculated, in which case they sell for maybe $3 tops.