Yes , relative rarity is a useful tool, and that is something you learn when you are in the hobby for a long time. Also, if an E101 Cobb in Very Good condition typically sells for $1500, and an E102 Cobb in the same condition sells for $1200, you assume the E101 is relatively scarcer. But it may not always be true.
Last edited by barrysloate; 04-02-2010 at 04:29 PM.
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