Who invented old metal coin safes?

What is the chemical name for the black coating on an old coin?

The black coating on an old coin is typically referred to as patina, which is a thin layer of oxidation that forms on the surface of metal over time. It can consist of various compounds depending on the metal composition of the coin, such as copper sulfides or oxides.

How old was Alexander graham bell when the phone was invented?

Alexander Graham Bell was 29 when he invented the telephone. He died when he was 75.

How do you find the age and price of a very old coin i mean i do have a very very old coin but i don't know the metal as well as when it was minted i only do know that it looks very old and the coin?

There are only two possibilities: - look for it in books and catalogus (library!) - send someone a good photo by email, both sides of the coin. My email: van.de.leest.m@skynet.be

Why would a twenty year old coin have a different mass to a brand new one?

There are several possible reasons:the alloy from which the coin is made was changed,the metal in the coin has reacted with chemicals in the atmosphere (or elsewhere),the coin has been clipped - bits of metal removed from the coin's edge. Some coins have their circumferences marked by "reeding" to prevent this.

What do Roman coins sell for on average?

The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.The answer to your question can only be "it depends". The value of a coin depends on its condition, its metal, and its rarity. A grubby old coin with worn engraving would be worth much less than a silver or gold coin with sharp images and engraving. There is no average price for, say, a denarius, because all of them are in various stages of deterioration.

When was the inventor of the metal detector born?

the metal detector was invented because people in old days use to use it so they could find stuff in there body I think

How much are four drachmas worth in US dollars?

it is unknown because they were crude ancient coins made in Greece that were pressed it depends how much metal is used in the coin itself also depends on how old the coin is

Is a nickel pretty old if the date on it is 1980?

As of 2013, the coin is 33 years old, which is not very old for a coin.

How do you identify an old coin?

look at the date on the coin.

What is a coin with the face of Charles Dickens that appears to be rather old worth?

Thi is a privately minted novelty item. If it contains precious metal, then its value will be based on the value of that metal -- otherwise it's worth a couple dollars at best.

Why would old coins have a lower mass than new ones?

Many countries have changed their coin compositions over the years. The reasons can be due to metal changes, size changes, etc. Another reason is that circulation will wear down a coin, so that an older specimen actually has slightly less metal on it than when it was new.

Name for an old French coin?

the Sou (alternate spelling 'sol') was an old French coin.