Most experts will not answer general questions of "How Much Is This Coin Worth?" mainly due to the fact that there is no simple answer. Dates, mintmarks, denomination, condition of the coin, and other factors provide a wide range of value quotes. Just the date or type of coin is not enough information to answer such a question. The best advice is to obtain a book from a bookseller or local coin shop called "A GUIDE TO UNITED STATES COINS" by RS Yeoman - The "Red Book" as it is called. This book is the mainstay for coin values for dealers and collectors. The ISBNs are = ISBN-10: 079482267-3 ; and ISBN-13: 978-079482267-5. Bear in mind that the quotes in that book are top-end retail; most collectors or dealers will most likely offer slightly less. You might find older volumes in some libraries; but these may have outdated quotes.
The U.S. Mint was not issuing gold coins in 1975.
The S mint mark on the coin identifies it as a proof coin that is only sold in proof sets from the mint. The retail value of a proof 1997s is $16.10 but if the coin was found in a bank roll or in change, it's now only worth face value.
A Proof set is $8.00 & a Mint set is $5.00
These coins have only just been released into circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 50 cents. If you have a Proof coin or an Uncirculated mint condition coin, they are worth whatever you just paid for them.
These coins are still in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 50 Pence. If it is a packaged mint or proof coin purchased from the Royal Mint, it will stll be worth whatever you paid for it.
The Mint didn't make any 1975-dated $1 coins.
$1 unless it is in proof condition or came in mint packaging.
The coin is still in circulation today and is only face value
A 1973 6 coin Proof set is $9.00. A 13 coin Uncirculated Mint set is $18.00.
One dollar, unless it's a proof coin still in the original package from the mint, spend it.
An Australian 1975 1 cent coin, uncirculated and in absolute mint condition could fetch up to $2 AUD. An Australian 1975 1 cent coin (Proof), uncirculated and in absolute mint condition could fetch up to $5 AUD. There were 134.775 million minted. They are no longer in circulation, but unless they are part of a proof set or as previously described, they are worth 1 cent. A reputable coin dealer will be able to give a more accurate valuation.
You just spend it. Unless you have a coin in a mint-set with an "S" mintmark that is either proof or uncirculated, your coin is worth $1.