Undated (August 1964) General Motors Roller Press Experimental Cent. Judd-Unlisted, Pollock-4055. Rarity-8. Copper. Plain Edge. MS-62 BN (PCGS). 20 mm. 61.6 grains. Coin alignment. <strong>Obv:</strong> "Lincoln Head" type with a portrait of the president similar to that used on the United States Mints regular issue Lincoln cent, with thin rim. <strong>Rev:</strong> Inscription MANUFACTURING / STAFF / DEVELOPMENT, for General Motors Manufacturing Development Staff, with thin rim. The obverse is that of Pollock-4055, but the reverse is unlisted therein; the <em>uspatterns.com</em> website refers to this die combination as "Pollock-4056." Well detailed for the type, the surfaces are generally medium brown in color, yet with ample mint orange color that is more pronounced on the obverse. There are no marks of consequence, only light carbon in and around the centers to explain the MS-62 numeric grade from PCGS.<p>Although once thought to have been a product of the United States Mint, the dies from which this type was struck are attributed to General Motors. They were made without official U.S. government knowledge at the firms Tech Center in Warren, Michigan on an electrical discharge machine (EDM). Actual Lincoln cents acted as models in the Elox EDM machine, which created the dies through the spark erosion process. A product of General Motors earlier testing as part of this project, these pieces were struck on one of the first prototype roller presses. Rare. PCGS# 810951. From the Estate of a General Motors Technical Center Employee. Pictured on page 70 of Vol. 36, Issue 1833 of <em>Coin World</em>, May 29, 1995, and page 6 of (our) Bowers and Merenas Rare Coin Review, No. 107, September/October 1995.
