Welcome to the forum, Bidswinger. Yours is a sensible question, with a reasonable answer. Regardless of the relative mintages, there are a lot more PF70's than MS70's. Business strikes are not struck and handled with the care that Proofs are - they strike 'em, throw 'em in a bag and ship them out to be rolled. It's a rare coin indeed which survives this process both unmarked, and with the perfect strike required of an MS70. On the other hand, though, the Mint has Proof production down to such a science that a PF70 is not all that rare a thing any more.
PCGS has graded 12 MS70 Silver Eagles between 1986-2006, total, and 5457 PF70's.
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