Metal Composition: 97.5% Zinc - 2.5% Copper after 1982
Diameter: 19 mm
Mass / Weight: 2.5 grams
What This Coin Looks Like (Obverse, Reverse, Mint Mark Location, Special Features, etc.): The US Mint produced two major varieties of the 1998 S Proof Lincoln Memorial Cent (Penny). The most common variety for the San Francisco minted 1998 S coin is the wide "AM" variety. Although the one shown above is the rarer close "AM" variety for this year and mint.
In the word "AMERICA" on the reverse of the coin: The close "AM" meant that the letters "A" and "M" were very close and almost touching while the wide "AM" had the two letters separated much more. In Addition: The initials "FG" was closer to the Lincoln Memorial Building on the wide "AM" variety and it was further away on the close "AM" variety. The difference between the close "AM" and wide "AM" varieties are shown in the example image below. Click the image to enlarge:
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