FINE-EXTREMELY FINE. A VERY RARE COMPLETE SET OF THE ELUSIVE 1909 CHINA CLAY PAPERS.
In 1909 the Bureau of Engraving and Printing tried a number of different methods to combat paper shrinkage during the printing process, which caused uneven perforations. In one such experiment, a higher mineral content was added to the paper mixture. This method was deemed unsuitable, and the experiment was discontinued. The China Clay issue is considered to be even rarer than the Bluish Paper stamps.
Ex Roy White. Each with either 1988 or 1989 P.F. certificate
EXTREMELY FINE GEM STRIP IN THE HIGHEST ATTAINABLE QUALITY. ARGUABLY THE BEST OF THE TEN GUIDE LINE STRIPS OF FOUR CERTIFIED BY THE PHILATELIC FOUNDATION.
With 1985 P.F. certificate
EXTREMELY FINE GEM. AN OUTSTANDING PAIR OF THIS RARE EARLY COIL.
With 1968 P.F. certificate