This question comes up fairly often and is a common misunderstanding. US $1 coins made up till 1935 aren't called "eagles" and they don't contain 1 oz of silver. They were ordinary circulation coins made for use in daily commerce. While they do contain silver, it's not as much - about 3/4 of a troy ounce.
"Silver eagles" are modern (1986 and later) coins sold by the Mint as investment pieces, not for spending; their value is linked to the current price of silver and the "$1" value is purely artificial.
The coin you have is often called a Peace dollar because it was minted to celebrate the end of WWI. Its value when minted was in fact exactly $1 because silver was much cheaper and its price was controlled. Today it has value not only for its silver content but for its interest to collectors. There's more information at the Related Question.
Your 1928 eagle silver dollar is actually a 1928 PEACE dollar, the first Silver Eagle bullion coin was made in 1986. But for this year of issue Peace dollar it's very important to see if there is a mintmark (S) on the reverse just above the eagles tail it makes a big difference in value. If you see the S a low value for the coin is $16.00 no S low value is $250.00. Take it to a dealer or collector for an assessment
The US did not print any two dollar silver certificates after 1899.
It is worth whatever melt is. The silver dollar is damaged and they never use rare dates (the 1928 peace dollar is rare, it is likely a 1928-S coin which is quite common) and so it would be worth about $20 for the coin. However, there is the question on whether the money clip itself is silver, usually the clip would be marked "STERLING" or 925 if it is silver. If the clip is silver, you have added value with whatever the weight of the silver clip is.
The Denver mint did not strike any silver dollars in 1928. You may have a 1928-S where the S is indistinct. This coin is worth $20 to $30 depending on condition.
There has never been an A mint mark. You're looking at the designer's monogram. The mint mark will be on the back between the word ONE and the eagle's tail feathers. See the related question for more details.
Your 1928 eagle silver dollar is actually a 1928 PEACE dollar, the first Silver Eagle bullion coin was made in 1986. But for this year of issue Peace dollar it's very important to see if there is a mintmark (S) on the reverse just above the eagles tail it makes a big difference in value. If you see the S a low value for the coin is $16.00 no S low value is $250.00. Take it to a dealer or collector for an assessment
45.00
The value of a 1928 Silver Certificate dollar is worth at least the amount of the face value. There are 6 different 1928 Silver Certificates, the value depends on the grade of the certificate. The best way to determine the value is to have the note appraised by a professional.
Hi, a 1928-D Peace Dollar is worth $14.00 :)
About $5 to $10
The US did not print any two dollar silver certificates after 1899.
1928 $50 bills weren't issued as silver certificates. Please check the wording across your bill's top front; then see one of the following questions:"What is the value of a 1928 US 50 dollar Federal Reserve Note?""What is the value of a 1928 US 50 dollar gold certificate?"
1928-series $100 bills weren't issued as silver certificates, only gold certificates and Federal Reserve Notes. Please look at the bill's front to determine which you have; then check one of the following: "What is the value of a 1928 US 100 dollar Federal Reserve Note?" "What is the value of a 1928 US 100 dollar gold certificate?"
It is worth whatever melt is. The silver dollar is damaged and they never use rare dates (the 1928 peace dollar is rare, it is likely a 1928-S coin which is quite common) and so it would be worth about $20 for the coin. However, there is the question on whether the money clip itself is silver, usually the clip would be marked "STERLING" or 925 if it is silver. If the clip is silver, you have added value with whatever the weight of the silver clip is.
The Denver mint did not strike any silver dollars in 1928. You may have a 1928-S where the S is indistinct. This coin is worth $20 to $30 depending on condition.
Retail value is $293.00-$456.00 for circulated coins depending on grade.
To clarify things, the US Mint only makes coins. Bills are printed by the Bureau of Engraving and Printing.Please see the question "What is the value of a 1928 US 1 dollar silver certificate" for more information.