Face value for all of them.
Priceless. The first Federal Reserve Notes were printed in 1914.
The only Federal Reserve Notes dated 1976 are $2 bills. In circulated condition they have no added value.
"A" is the highest series letter for 1928 $50 Federal Reserve Notes. "K" is most likely the Federal Reserve District letter. The series letter, if any, on US bills is next to the date. Please see the question "What is the value of a 1928 US 50 dollar Federal Reserve Note?" for more information on values.
U.S. Notes have red seals. Federal Reserve Notes have green seals. See the related question for U.S. Notes.
Series letters for 1950 $10 Federal Reserve notes were only go up to E. You're probably looking at the Federal Reserve District letter; the series letter is next to the date. Please post a new question or alternately, check the link below.
Series letters for 1950 $10 Federal Reserve notes were only go up to E. You're probably looking at the Federal Reserve District letter; the series letter is next to the date. Please post a new question or alternately, check the link below.
All $2 Federal Reserve Notes are worth only face value if circulated, $2.50 to $3.00 uncirculated.
Federal Reserve Notes can be spent or exchanged at a bank for their face value regardless of how old they are. None have ever been withdrawn or demonetized. However, older FRN's are often of interest to collectors and could be sold for more than their face value but a dealer or appraiser has to determine that premium.
Please check your bill again and post a new, separate question. The Federal Reserve System wasn't established until 1913 and the first Federal Reserve Notes are dated 1914.
Even though your bills have the phrase "redeemable in gold" on them they're Federal Reserve Notes rather than gold notes. $10 gold certificates were also printed in the 1928 series but they don't have any series letters. 1928 A $10 FRNs are definitely worth more than 1928 B bills, but the difference depends on the issuing Federal Reserve Bank letter. Please see the questions "What is the value of a 1928 A US 10 dollar bill?" and " ... 1928 B ... " for more information.
The first $20 Federal Reserve Notes were dated 1914. Please check your bill again and post a new, separate question.
The first Federal Reserve notes were printed in the 1914 series. Denominations were $5, $10, $20, $50, and $100. They were printed with both red seals and blue seals; green wasn't adopted as the standard seal color until 1928. In general, 1914-series FRNs with red seals are worth several times the value of their blue-seal counterparts.