$1 US 1981 - PROOF S Susan B Anthony "TYPE 2 CLEAR"
1981 S Susan B Anthony Dollars : Type 2 - Clear S - Proof
Clad Composition
Mintage: N/A
Minted at: San Francisco
Designer - Engraver: Frank Gasparro
Metal Composition: 91.67% Copper - 8.33% Nickel
Diameter: 26.5mm
Mass/Weight: 8.1 grams
What This Coin Looks Like (Obverse, Reverse, Mint Mark Location, Special Features, etc.): 
The 1981 Type 2 Clear S Susan B Anthony (SBA) dollar has a much clearer and well-defined S mintmark and is also found only as a proof coin. Below is an example comparison image between the filled "S" type 1 and the transparent "S" type 2: 
