Hello,
The date list for this coin incorrectly includes the 1982S Proof issue. The 1982S Proof was minted only in the old copper alloy (KM# 201), not in the new copper-plated zinc (KM# 201a and b). The 1982S is incorrectly listed under both KM#s in Krause, however R.S. Yeoman's Guide Book of United States Coins (Red Book) includes it only under the old copper alloy coin. Note also that the mintage figures for both coins are exactly the same, which is highly unlikely.
The 1982S Proof is already included in the date list for KM# 201...
https://en.numista.com/catalogue/pieces42.html
...but it needs to be removed from KM# 201b...
https://en.numista.com/catalogue/pieces43.html
Best regards,
David