1919 2c carmine rose, "1" with serifs variety (position 5), used on first flight cover from Barranquilla to Puerto Colombia, signed Herbert Bloch, cover creases away from the stamp, which is well centered and v.f. Only 20 copies of this variety were printed, cat. $4500 (Cat No. C1a) (Image)

Cat. $4500, Est.US$3,000