It is possible to change a nickel weighing 51 grams of copper (16 ruble stop) for a nickel weighing 33.3 grams of copper (24 ruble stop) without loss only if the purchasing power of the coin is in no way related to the price of the metal from which the coin is minted.
The rings, as a full-fledged copper coin, could not avoid comparison with the market price of copper, from which they were minted - especially since by 1821 the price of copper on the market rose to 31 rubles for 1 pood.
In other words, in 1821, when melting a 5-kopeck coin minted in 1807 weighing 51 grams into metal and selling this metal, it would be possible to get copper worth 9.7 kopecks on the market – almost 100% income.
This income was classified as criminal: the Russian Ministry of Finance categorically prohibited the melting of copper coins for the purpose of selling metal.
From the position of modern economic theory, it would be necessary to radically reduce the weight of a 5-kopeck copper coin - as well as other copper coins - and turn a nickel into a change coin torn from the value of copper.
Instead, they did something completely different: copper nickels were withdrawn from circulation and 5 kopecks of a new sample were minted-already from silver, thereby turning the nickels into a full-fledged silver coin.
Today, 200 years after the release of copper rings from circulation, the collectible value of their individual varieties (Small Crown) may exceed the cost of silver coins of that era similar in weight: heavy rings were sent for melting – and increased their rarity for numismatists.