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<p>[QUOTE="Ed Snible, post: 3493423, member: 82322"]I only think about "market rarity", my chance for purchasing a coin on the Internet numismatic market in the 21st century. I am not interested in what was common when the great collections were being assembled by 18th century aristocrats.</p><p><br /></p><p>A coin is "common", to me, if there are multiple examples for sale online. Market availability has a lot to do with dealer optimism. Some "scarce" types appear to be common because a few dealers have G or VG condition specimens on their web sites at 5x market value.</p><p><br /></p><p>A coin is scarce if multiple examples are offered in a single year.</p><p><br /></p><p>A coin is "extremely rare" if zero or one example appear for sale during the lifetime of an active collector. For example, <a href="https://www.cngcoins.com/Coin.aspx?CoinID=75576" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.cngcoins.com/Coin.aspx?CoinID=75576" rel="nofollow">this coin of Akraiphion</a> in Boeotia which sold in a 2006 auction; no coins of the city had sold before that since 1879.</p><p><br /></p><p>David Hendin and Arthur Houghton wrote an article on rarity for <i>The Celator</i> in 2008. They tried to relate absolute rarity to relative rarity. For example a ‘rare’ Seleucid bronze should have 10-30 known specimens, while a rare Jewish silver coin has 25-75 examples.</p><p><br /></p><p>Valuable coins appear less rare than they actually are. A $15,000 coin with 10 known specimens seems to appear on the market more often than a $150 coin with 10 known specimens.[/QUOTE]</p><p><br /></p>
[QUOTE="Ed Snible, post: 3493423, member: 82322"]I only think about "market rarity", my chance for purchasing a coin on the Internet numismatic market in the 21st century. I am not interested in what was common when the great collections were being assembled by 18th century aristocrats. A coin is "common", to me, if there are multiple examples for sale online. Market availability has a lot to do with dealer optimism. Some "scarce" types appear to be common because a few dealers have G or VG condition specimens on their web sites at 5x market value. A coin is scarce if multiple examples are offered in a single year. A coin is "extremely rare" if zero or one example appear for sale during the lifetime of an active collector. For example, [URL='https://www.cngcoins.com/Coin.aspx?CoinID=75576']this coin of Akraiphion[/URL] in Boeotia which sold in a 2006 auction; no coins of the city had sold before that since 1879. David Hendin and Arthur Houghton wrote an article on rarity for [I]The Celator[/I] in 2008. They tried to relate absolute rarity to relative rarity. For example a ‘rare’ Seleucid bronze should have 10-30 known specimens, while a rare Jewish silver coin has 25-75 examples. Valuable coins appear less rare than they actually are. A $15,000 coin with 10 known specimens seems to appear on the market more often than a $150 coin with 10 known specimens.[/QUOTE]
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