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Message:: [QUOTE="900fine, post: 351505, member: 6036"]It depends on the series. One must eyeball the entire series and make a call custom to that series; it's impossible to come up with a "one size fits all" formula. For instance, I collect Indian $2.5 quarter eagles. Take a look at that series - what do you see ?  It's very clear - that series has one key, and all others are almost identical in price. There are no semi-keys. The one key is as valuable as all others combined. It's also dependent upon what grade range you're collecting. My Indian $2.5s are AU55 - MS62. In that range there are no conditional rarities - all are about the same price (except for the key 1911-D). But get way up there, MS64 and up, and suddenly some dates are extremely tough, so they act like semi-keys. A Red Book is adequate to spot keys and semi-keys for a given grade range. It's all subjective.[/QUOTE]