Lot
317 
Korea, 1950, 150wn Green, tied by purple Seoul, Korea cds on airmail cover to Garden City, N.Y., Very Fine. Scott No. C3 Estimate $500 - 750.
A Linn's article from July 2, 1979 describes this as one of the rarest stamps of Korea to find on cover, with one from a 1979 offering at auction realized $1,200.