Seated quarters seem to being doing quite well lately, comments?

I've been watching these of late, both proof and business strike. Both seem to be doing quite well. Many selling for multibles of sheet prices. Comments from the experts?
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Comments
Many of the rare dates have less then 200 examples known. Those being the CC's and the early S mints and O mints. Also the late P mints coins of the 1880's.
Buying top quality Seated Dimes in Gem BU and Proof.
Buying great coins - monster eye appeal only.
Ray
I really like all of the 19th century proofs and want to make a type set.
<< <i>Well as far as the PF64's go they've been around a grand forever......Someday they have to take an upward hit since there's just not that many of them made.
I really like all of the 19th century proofs and want to make a type set. >>
I've thought about doing this myself, except the gold. Would make a fun set.
Greg
Don't even think about going after nicer examples of better date with "sheet" money. You'll get your ass laughed at, most likely.
An authorized PCGS dealer, and a contributor to the Red Book.
Buying top quality Seated Dimes in Gem BU and Proof.
Buying great coins - monster eye appeal only.
J
https://www.pcgs.com/SetRegistry/collectors-showcase/world-coins/one-coin-per-year-1600-2017/2422
That's over 75 dates/mints if I recall correctly. Even a "lowly"
1859-0 quarter is rarer than a 1901-s in relative terms with something like 300-500 in existance (and 3-5 gems).
I recently picked up the rarest and most underrated "O" mint imo and paid 3X CDN for it (note: it ain't the 1849-0!)
roadrunner