Weight - 406.8 grains
Mint Cabinet (presumably pulled from bullion
deposits in the early 1800's by Adam Eckfeldt) - National Numismatic
Collection of the Smithsonian Institution.
Breen, Walter, "Walter Breen's Complete Encyclopedia of United
States and Colonial Coins", copyright 1988 by F.C.I. Press, New
York, NY, pp. 92-93