Proof Grading in Classic Coinage

Reading in QDB's Expert's Guide about proof coinage in the 1800s and early 1900s and looking at proof coins available at auction over the last few days online. Not necessarily going to buy, but trying to apply Bowers' ideas to what is on the market right now. I'm specifically addressing Liberty Seated and Barber coins, as well as the Liberty nickels. Bowers takes a dim view of dark toning on proof coins but it seems like he's also wary of overly "clean" proofs as well. There are PF-62 coins available at more reasonable prices than higher grades. Assuming that there is an acceptable amount of toning on a PF-62 coin in a series you like - do you bid on the coin, try to find one with a higher grade, or try to find an higher grade MS coin that is acceptable?
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Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
What you'll see on a 19th century proof are hairlines from the coin's having been wiped by a cloth (frequently in an effort to remove toning, I believe).
I also agree that you'll see a lot of hairlines on a PF-62. You may have to go up to PF-64 to find a coin without serious hairlines.
Check out the Southern Gold Society