United States & Worldwide Stamps

1861 1/2gr green, horizontal pair, with parts of adjoining stamps at left and at bottom, tied by grid cancels on large part of outer FL (side-flaps missing), blue Harzburg 7.12 departure pmk and arrival datestamp on back, lettersheet refolded at top and bottom, with some erasures on front, stamps apparently v.f. A rare piece for a specialist, with Sismondo certificate ("a rare item of postal history, in which the outstanding condition of the stamps becomes the determinant factor") (Mi.10B, Euro 8,000 for two stamps; Euro 15,000 for single on cover) -
Estimate price: $2800-3000