The 1951-S Lincoln cent is common, circulated coins have retail
values of 5 to 15 cents.
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1951 was the last year of issue for this coin (1946-1951) it was
struck at all 3 Mints. Assuming it's circulated and has no
Mintmark, the retail value is $10.00 to $21.00 depending on how
much wear the coin has.