esmeeow's 1990 S Lincoln Memorial Cent Small Cents : No S Mint Mark

What this coin looks like (obverse, reverse, mint mark location, special features, etc.):


Some 1990 S Lincoln Memorial Cents (Pennies) did not receive an S mint mark on the coin. These are extremely rare and valuable. The San Francisco Mint produced only Proof coins and this error coin is also a Proof coin so we know it came from the San Francisco Mint but the S mint mark is absent.

Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD

Good (G-4)	Very Good (VG-8)	Fine (F-12)	Very Fine (VF-20)	Extremely Fine (EF-40)	About Uncirculated (AU-50)	Uncirculated (MS-60)	Uncirculated (MS-65)	Proof (PR-65)
-	-	-	-	-	-	-	-	3,515

MELT VALUE: $0.0078