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<p>[QUOTE=&quot;The_Cave_Troll, post: 141999, member: 1674&quot;]In 1967 Al C. Overton wrote a book called &quot;US Early Half Dollar Die Varieties 1794-1936&quot;.&nbsp; In that book he listed all the know bust half die varieties (he did quite a good job as fewer than 10 new varieties have been added in the last 3 decades).&nbsp; He called (in the 1970 edition of his book) the different die pairs o-101, o-102, etc for each year; so each o-1xx number represents a different die marriage as assigned by Mr. Overton.&nbsp; As for the R5, R3 part, those are rarity figures.&nbsp; Overton (and bust half collectors as a whole) use the Sheldon Rarity System where:</p><p>R1 is common (1000+ pieces known)</p><p>R2 is Slightly uncommon (501-1000 pieces known)</p><p>R3 is Scarce (201-500 pieces known)</p><p>R4 is Very Scarce (81-200 pieces known)</p><p>R5 is Rare (31-80 pieces known)</p><p>R6 is Very Rare (13-30 pieces known)</p><p>R7 is Extremely Rare (4-12 pieces known)</p><p>R8 is Unique or nearly so (1-3 pieces known)</p><p><br /></p><p>I hope that helps.[/QUOTE]</p><p><br /></p>

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