I've been reading some collector books on bills.
Fascinating amount of detail.
Engaging the collector community will be interesting once I have a list of star notes.
here are all the relevant printings of $20 bill and series year.
The 1934/1950/1963/1969 seems odd, until you see that those were the years that had printing or $20 bills.
none in intervening years.
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Register or
LoginType Series Treasurer Secretary Seal
Federal Reserve Note 1934 Julian Morgenthau Green
Federal Reserve Note 1934 Hawaii Julian Morgenthau Brown
Federal Reserve Note 1934A Julian Morgenthau Green
Federal Reserve Note 1934A Hawaii Julian Morgenthau Brown
Federal Reserve Note 1934B Julian Vinson Green
Federal Reserve Note 1934C Julian Snyder Green
Federal Reserve Note 1934D Clark Snyder Green
Federal Reserve Note 1950 Clark Snyder Green
Federal Reserve Note 1950A Priest Humphrey Green
Federal Reserve Note 1950B Priest Anderson Green
Federal Reserve Note 1950C Smith Dillon Green
Federal Reserve Note 1950D Granahan Dillon Green
Federal Reserve Note 1950E Granahan Fowler Green
Federal Reserve Note 1963 Granahan Dillon Green
Federal Reserve Note 1963A Granahan Fowler Green
Federal Reserve Note 1969 Elston Kennedy Green
Federal Reserve Note 1969A Kabis Connally Green
Federal Reserve Note 1969B Bañuelos Connally Green
Federal Reserve Note 1969C Bañuelos Shultz Green
Was thinking about paper. I believe the paper used as not changed since those years.
They did some experimental runs of different paper (like the so-called Natick paper) for $1 bills in 1981
Still reading but I think $20 paper has always been consistent.
U.S. currency is printed on special paper made by Crane Paper Company. Unlike traditional paper made of wood pulp, the paper used for currency is made of 75 percent cotton and 25 percent linen.
Idea: I wonder if the cotton/linen mixture decays in a non-uniform manner. Maybe interesting in terms of understanding the holes in the cooper money found.