Good things come in small packages. With a 1970 proof Mint set, a small date can be valuable. Some coin value guides have estimated the face value of these Mint proof coin sets at $4 and the selling price at $58. The large date US mint sets from 1970 sell for $24. If you have to squint to see the date on a 1970 cent or dime in a proof mint set it's a valuable coin. According to an auction on eBay, a small date 1970 Lincoln penny "books" or is valued at $1,200 in MS67--the seller claims to have a rare MS70, which most numismatic experts say is nearly impossible to find. Imagine how much more the whole proof Mint set is worth!

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