Coin books contain a wealth of information. Many include mintage figures and prices. The problem with prices is they change regularly, so the question comes up whether a coin book is current. The answer is it depends on the coin.
Some coins change slowly on value. In particular, copper, bronze, and nickel coins often are slow to change in value. Of course, extremely rare coins can fluctuate as the latest coin of a kind to be sold at auction resets the expected value.
Precious metal coins that are not extremely rare are not so stable. Value can change overnight. No coin book can be accurate for coin values tracking the precious metals market. In addition to the precious metals market one must also take into account that the mintage figures can be misleading, since many common precious metal coins can be melted down when their metallic value soars.
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The Morgan initially had two versions, probably because the mint decided to change the look. The easiest way to determine which variety one has, and they are worth different amounts, is to count the tail feathers. The Morgan ceased for a lengthy period, and when more dollar coins were minted in 1921 it was revived, but shared the year with the next silver dollar, the Peace Dollar. why? Perhaps the new design was not ready in time.
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How many tail feathers are on the eagle in first-year Morgan dollar coins? Why did the number vary? Why was the Morgan dollar coin last minted in 1921?