Modern coins generally have dates, telling which year they were released. Or, at least a year close to release. Many coins are, like automobiles, released a few months early. And in one rare case the Perth Mint released three years o lunar coins when finishing p series one, some years in advance. Occasionally, a problem exists and coins are not ready for release during the year stamped. I doubt the would be melted down by the mint. But, the date approximates the release.
The real problem comes with ancient coins Many were released prior to a calendar being in place, so they cannot have a date stamped on them. some of these can be dated by evens they depict, like a military victory, and by who is on the coin.
Some coins are dated with a different calendar, like Hebrew coins and Chinese coins. These preceded our calendar, but so did the calendar of the region. They can put a coin in a two year spread. Really, it is a one year span, but it overlaps two of our years.
So, not all coins have dates, and in a few rare cases the dates are not the year of release.
Blaack Spaniel Gallery Coins
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