US - Inverted Jenny

US - Inverted Jenny ( C3a, 1918 )

C3a- Inverted Jenny

C3a - a block of Inverted jenny

C3- the Jenny

Only one sheet or 100 Inverted Jenny. William T. Robey purchased at a Washington, D.C., post office on May 14, 1918, the first day of sale. The other eight sheets undistributed then distroyed. He sell this sheet to Eugene Klein for $15.000. The postal clerk who sold Robey didnt know the plane is inverted cause he never saw a plane before.

Klein sold it to a millionaire Colonel Edward H.R. Green for $20,000. Colonel Green divided the sheet and kept four blocks and a single for himself, total 41 gems.