4 Year - Bronze Engraved Friend of Bill W. - 1 1/2" [Challenge Coin Size] AA (Alcoholics Anonymous) - Sober / Sobriety / Birthday / Anniversary / Recovery / Medallion / Coin / Chip 4 Year - Bronze Engraved Friend of Bill W. - 1 1/2" [Challenge Coin Size] AA (Alcoholics Anonymous) - Sober / Sobriety / Birthday / Anniversary / Recovery / Medallion / Coin / Chip Back: Engraved with "Friend of Bill W." 1 1/2 inch (39mm) Round Bronze Antique Minted in the USA by Northwest Territorial Mint (NWTM)