Autographs of classic coin designers

How difficult is it for a collector to obtain autographs or signatures of historically important classic coin designers? The internet does not appear to have very much information on this topic (or maybe I'm looking in the wrong places).
My Adolph A. Weinman signature
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Pen signed autographs might be very difficult to acquire. Try the major auction house archives: Heritage, Bonham's, Goldberg's, Stack's. There are probably many originals on documents in The National Archives, but obviously they aren't obtainable, except maybe as scans.
cdaughtrey.com - coin designer lithographs
"Everything is on its way to somewhere. Everything." - George Malley, Phenomenon
http://www.american-legacy-coins.com
Chuck Daughtrey is a very talented artist who has created some excellent lithographs of classic U.S. coin designers. Forgot his member name here.
Pen signed autographs might be very difficult to acquire. Try the major auction house archives: Heritage, Bonham's, Goldberg's, Stack's. There are probably many originals on documents in The National Archives, but obviously they aren't obtainable, except maybe as scans.
cdaughtrey.com - coin designer lithographs
He's "coppercoins", and I do have one of his excellent lithographs.
I browsed some of the auction houses you suggested, coin designer autographs appear to be few and far between. I wonder if it's lack of availability or lack of interest.
My Adolph A. Weinman signature

Depending on how the future collectors see our current coinage!
Jim
During my research in writing the biography of Robert Scot, I acquired around 200 copperplate engravings by Scot, most of them still intact in 18th century books, the majority for Thomas Dobson's Encyclopædia. This has turned into a very interesting side hobby, and some of these antiquarian books are extremely rare.
My Adolph A. Weinman signature
