Of a philatelist, philanthropist, or numismatist, the 1 that isn't by definition, a collector of stamps or coins
In coin catalogues, unc. stands for this
1 of the most valuable errors in U.S. stamps was a 1918 24¢ airmail stamp with the plane in this position
Color of R.S. Yeoman's standard reference work giving retail prices of U.S. coins
Quarters & dimes as well as the coin nicknamed for this 28th element are now made with it
The world's 1st airmail stamp was privately issued in 1877 for mail to be carried on 1 of these