U S A Valuable USA – 1867, 90¢ blue, F. grill – SOLD for $1,300 MyNation May 16, 2020 1867, 90¢ blue, F. grill (Scott 101), bright color and well centered; extraordinary example of this notoriously difficult grilled stamp, Very Fine, with 2017 P.S.E. certificate. Scott $2,250. Estimate $1,200 – 1,800