I believe that those are 22kt, and net out at half an ounce each.
Later $100's, after 1984 or so (not sure of exact date), have a lower fineness and net out at a quarter ounce each.
Numismatist. 54 year member ANA. Former ANA Senior Authenticator. Winner of four ANA Heath Literary Awards; three Wayte and Olga Raymond Literary Awards; Numismatist of the Year Award 2009, and ANA Lifetime Achievement Award 2020. Author of "The Enigmatic Lincoln Cents of 1922," Available now from Whitman or Amazon.
Comments
Later $100's, after 1984 or so (not sure of exact date), have a lower fineness and net out at a quarter ounce each.
Ahh, thanks guys! Given the denomination I thought they were a full oz. That would have hurt!