The Knob Hill Collection #661

Offices in China, 1919, 14¢ on 7¢ black (Scott K7), o.g., never hinged, an immeasurable showpiece with tantalizing rich color and finely etched impression, this GEM quality stamp is probably the finest known copy of this stamp, Superb, 2013 P.S.E. certificate graded SUP-98 (1of only 2 examples to achieve this remarkable grade, and is the HIGHEST GRADED K7 according to PSE's population report).
SMQ $3,450 in the grade of Sup-98.
Scott $225.
Estimate $3,000 - 4,000.