Please check again and submit a new, separate question. The last $5 United States Notes were dated 1963, and the only US bills dated 1976 were $2 Federal Reserve Notes.
one dollar
The face value of any coin or bank note is what is written on it, in your case, One Dollar. However there were no 1976-dated US $1 bills, only $2 bills.
One dollar.
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50 cents.
Could you check your bill again? A red seal would indicate that your bill is a United States Note; the first $2 FRNs were dated 1976 and have green seals. If you have a US Note, there's more information at the question "What is the value of a 1928 US 2 dollar bill?"
50 cents.
50 cents.
2 dollars.
All circulated bicentennial dollars are worth one dollar.
A perfect uncirculated 1976 $2 note is worth $3-$6. Any other condition is face value ($2). Note that all $2 bills dated 1976 and later have been issued as Federal Reserve Notes, so they all will have green seals.
That's a bicentennial dollar, and it's still worth one dollar.