1912 $20 PR67 NGC....
Fine-Grained Sandblast Proof Specimen
In The Coinage of Augustus Saint-Gaudens as Illustrated by the Phillip H. Morse Collection, the authors write:
" ... The term 'matte' was not used until contemporary times, as it was not as descriptive as 'sandblast.'
"The sandblast proofing process was hardly unique to American coinage. Europeans, particularly the British and the French, had already been using it for several years on their specialty coins and medals. The U.S. Mint in the late 19th century had also occasionally sandblasted medals. The coins were struck on hydraulic medal presses that produced more striking pressure than the conventional presses used for normal coinage. Planchets were still specially selected, but the dies were not polished. Instead, they were inserted in the high pressure medal press and struck once. The resultant coin possessed sharper detail overall, and often, a high, sharp fin rim from excess metal that squeezed into the tiny space between the dies and the collar. After striking, the coins were taken to a small enclosed cabinet, and carefully sandblasted on each side with a stream of fine, industrial sand to impart a dull, grainy effect. The fineness of the particles and skill of the workman doing the sandblasting governed the shade and appearance of the particular coin, ranging from light yellow-gold, to light brown, to deep khaki-green color."
The 1912 issue is renowned for the sparkling individual facets or fine grains that appear clearly on this coin when examined with a loupe. The surfaces are yellow-gold overall, with a slight greenish undertone. A full wire rim encircles the obverse and most of the reverse, save for the upper portion. The only mentionable flaw, not discernible at all angles, is a small near-shiny area near the bend in Liberty's knee. Census: 12 in 67, 1 finer (6/11).(Registry values: N10218) (NGC ID# 26GZ, PCGS# 9209)
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Revised Edition by James L. Halperin, Mark R. Borckardt, Mark Van Winkle, Jon Amato, and Gregory J. Rohan, with special contributor David W. Akers
The Coinage of Augustus Saint-Gaudens is an issue-by-issue examination of these two artistically inspired series of gold coins.
Each date and mintmark is reviewed with up-to-date information, much of which has never been previously published. The book is based on
two extraordinary collections: The Phillip H. Morse collection and the Dr. and Mrs. Steven L. Duckor collection.
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