US Banknotes

"A" is the only possible series letter for a 1988 $20 bill. You may be referring to the Federal Reserve District letter. The series letter, if any, on US bills is next to the date.

In any case the bill is new enough that it's only worth face value if it's been in circulation. Uncirculated ones might be worth an extra dollar or two.

Not more than $2 most likely. It's an ordinary $2 bill trimmed with gold by a private company and sold at an inflated price as a "collectible". Gold plating puts a small, small, small amount of gold on the object and it usually costs a bit more to take it off than the gold is actually worth.

The average value of a 1953 five dollar silver certificate, in mint condition, as of 2013 is $15.00.

It depends on when your bill was printed.

Bills printed in 1976 and later show the interior of Independence Hall.

Older $2 bills have a picture of Jefferson's home, Monticello. There is a small caption on the bill identifying it.

The banner across its top and the blue seal indicate it's a silver certificate, a form of paper money that was discontinued in the 1960s.

Please see the question "What is the value of a 1935 F US 1 dollar silver certificate?" for detailed information.

There's a page showing all high-denomination bills at the BEP website, linked below

Normally it would be necessary to have its denomination but the only bill fitting that description is a $1 silver certificate. Please see the question "What is the value of a 1935 F US 1 dollar silver certificate?" for detailed information.

You have a Coronet Head $5 Half eagle coin - if this specific 1906 coin is in fine condition (F12), it is worth: $ 250.00

Please check again and post a new question. The last $5 silver certificates were dated 1953. The only US bills that were dated 1957 were $1 silver certificates

If you mean turn them in for silver? you can't, June 24 1968 was the last date to redeem silver certificates.

An A series in avg.condition is worth around $12.50.

The only US bills dated 1957 are $1 silver certificates and these had blue seals.

The nearest dates for red-seal $2 bills are 1953 and 1963. There's more information at the Related Questions.

Not every old bill is automatically a certificate so it's important to check carefully.

If it has a gold seal and says "Gold Certificate", see the question "What is the value of a 1928 US 10 dollar gold certificate?" for values.

If it has a green seal and says "Federal Reserve Note", it's not a certificate, it's a Federal Reserve Note. See the question "What is the value of a 1928 US 10 dollar Federal Reserve Note?" for values.

7 different varieties were made. See the related link below for there values.

This means that that note is a replacement to a damaged note. These usually have a value above face value but not much more. For example you might get $1.50 or $2 for a star $1 note.

It's worth exactly 20 dollars.

The words that appear on the Great Seal of Us are as follows :

"Ba da ba da da, I'm lovin' it."

The value of a 2-dollar bill from the G series, which was issued in 1976, typically ranges from its face value of $2 to around $5 or more, depending on its condition and whether it has been circulated or is uncirculated. Bills in excellent condition or with unique serial numbers can fetch higher prices among collectors. However, G series bills are not rare and are generally not considered valuable in the way that other older currency might be. Always check with a currency collector or appraisal expert for precise valuations.