A 1972 US cent would be made of solid bronze and have a different color than a new one, but not goldish. If it sticks to a magnet, it is either not real or has been coated with some metal with magnetic properties.
Assuming you found it in circulation, at most 2 cents depending on how worn it is.
A normal 1979 penny will not stick to a magnet -- it's made almost entirely of copper -- a non-magnetic material. So for your coin to stick to a magnet, it has to either be fake, or plated with some kind of magnetic material. In either case, it's value would only be as a novelty item -- perhaps a couple dollars at best.
If a penny sticks to a magnet, it is likely a result of the penny being made of certain metals, such as zinc or steel, which are magnetic. Pennies minted after 1982 in the United States are made predominantly of zinc, which contains magnetic properties.
A silver penny from 1943 that sticks to a magnet is likely rare and could be a potential error coin. During this time, U.S. pennies were typically made of zinc-coated steel due to the priority of copper for the war effort. If your coin is indeed made of silver and sticks to a magnet, it may have been altered or could be a counterfeit. We recommend consulting with a coin expert or a professional to assess its authenticity and value.
Try the magnet test, if it sticks to it, it's steel.
Test it with a magnet. 1943 steel cents are magnetic. 1944 copper cents are not.
Put it under a magnet. If it sticks it is a steel penny. If it does not stick take to a collector or professional who can examine it further and give you a answer.
You can tell if a 1944 penny is made of steel by using a magnet. Place a magnet near the penny - if it sticks, then the penny is made of steel. Steel pennies were issued in 1943 due to a shortage of copper, so any 1944 penny made of steel would be an error.
Unless it's a proof coin, 1¢ Note that this site has a Coins and Currency thread for asking questions about, well, coins and currency. Money and Credit is for things like checks, credit cards, loans, etc.
No, a US silver dollar does not stick to a magnet because silver is not a magnetic metal. United States silver dollars are made primarily of silver, which is a non-magnetic metal, so they will not be attracted to a magnet.
Some coins, such as the U.S. penny and nickel, are magnetic due to their composition. You can test their magnetic properties by using a magnet to see if the coin is attracted to it. If the coin sticks to the magnet, it is magnetic.
A genuine copper (bronze actually) 1943 Philadelphia issue Lincoln cent has a minimum value of $60,000.00.