20S, 18k gold HC, 19J. Rated 5 stars in Gilbert’s book. 1 of 4 known. Fully authenticated as original by several horologists with detailed photos of all parts. Circa 1861. Historically significant because this was the beginning of the quality American made pocket watch industry in the U.S. Mint perfect dial, very fine condition movement, case shows wear but no damage. EXTREMELY RARE.