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VERY FINE AND EXTREMELY RARE. THIS IS THE ONLY EXAMPLE OF THE 30-CENT CONTINENTAL GRILLED STAMP CERTIFIED AS GENUINE BY THE PHILATELIC FOUNDATION.
It is believed that the Continental grills were made experimentally in 1876, after a stamp-cleaning court trial renewed fears of stamp re-use. The primary source of the rare J Grills was the Worthington collection, which was dispersed in 1917. The Aug. 21, 1917 sale by J.C. Morgenthau contained a block of four. It is believed that most or all examples in collectors' hands came from the archive of Charles F. Steel, who patented the grilling machines used between 1867 and 1873.
With 1957 and 1997 P.F. certificates. (Image)