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what are 10p coins made of

What are the allowed deviations of coin we.

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gxseries 05 Sep 2005

Coin weight is one of the hardest aspects of a coin to be counterfeited as there are various combinations of metal alloys, unless coins from the same period were melted down and then reused, which can be a possiblity.

But, what are the allowed deviations? I know that this varies specifically from what periods and what countries they were minted in. For example, for most modern coins, the allowed "error" range would be approximately 5%+- (most likely lower than this figure) off from the standard usual weight or +- 0.1 gram, which could be another example.

But can we apply this to coins that were minted in let's say around the 1800s? 1700s?

From what I read, there were some countries that were absolutely strict about their coin weight, as coins were mainly backed by the metal content. Does anyone know the range of such variances during such periods? And especially how if you minted over 10,000+ coins and making sure that almost all of them were under minted under strict weight conditions.

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Жtheling 05 Sep 2005

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jtryka 05 Sep 2005

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jtryka 05 Sep 2005

I should also mention that since the beginning of the mint in 1792, all coins produced were required to be independently assayed by another office in the government (I forget which) to ensure they met the standards required by law. Also, there was in interesting article in Coin World this last week about contemporary counterfeits in the 1890s. Since silver bullion was so cheap (at the low, the value of the silver in a silver dollar was worth less than 50 cents) many counterfeiters were producing coins with greater fineness and more silver than the US Mint, and they were still making

a profit!

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gxseries 07 Sep 2005

Hm. I have read that most countries were very strict when it came to such metals in modern mintage.

I mean, I still haven't come across any materials that discusses how mints used to check and control such massive mintage.

I am assuming that such coins were weighted in terms of thousands, but that will not single handly pick out coins that are overweight or underweighted.

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jlueke 07 Sep 2005

The same situation holds true for United States issues. Before the advent of more precise manufacturing techniques, silver and gold coins in the early Federal period often exhibit adjustment marks to ensure the coins contained the precise amount of silver or gold required by law. Since the dollar was defined by Congress as a specific weight of silver in grains, it must have had incredibly tight tolerances (one grain in avoirdupois is equal to 0.002285 oz.). The original act defined a dollar as 416 grains (0.8667 troy oz. or 26.96g) total, or 371 4/16 grains of pure silver, while the eagle ($10) was 270 grains (0.5625 troy oz. or 17.5g), or 247 4/8 grains pure gold.

On quarters it was a few tenths of a gram. I discovered this when calibrating my specific gravity measurement device. All the coins were of good silver but there was a noticeable if not large variation.

I believe the exactness came more in bulk than in individual coins. Each $1000 worth of silver would have a very strict tolerance in percentage terms while an individual coin could have a little more leeway.

I have the numbers on my other machine, I'll post them tonight.

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Жtheling 07 Sep 2005

Depends entirely on the coinage system in operation and upon how society accepts the cash.

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Жtheling 07 Sep 2005

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