1891 Proof Set Value?

Have run across an 1891 proof set, pcgs with grades ranging 63-65 (dollar is 62, dime is a 65) with great matcing eye appeal. Question: how much additional value would you put on a set like this over the value of the individual coins per graysheet if any? It's tough to do a date set in proof, have tried in the past so I think some premium is justified. Question is, how much. Graysheet value bid of these is around $3800 total. Is the set worth $4600? The nickel and Quarter are Cam's.
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Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
While I have no experience at all in buying proof sets of that caliber, I have a strong suspicion that you can throw the Greysheet out the window. Especially Greysheet bid price. Fuhgeddaboutit. Is the set you mentioned worth $4,600? Quite possibly. I suppose that's up to a bidder. Stuff like this usually is sold at auction, I'd imagine.
michael
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Type collector since 1981
Current focus 1855 date type set