Watch List notes:

HONG KONG: AE die trial, 1864, Prid-321, 39mm copper die trial, "1864" in center with HONG KONG -CHINA MINT around // ENGINEERS / LONDON / J.WATT & Co. / & / SOHO / BIRMINGHAM, all legends retrograde, variety with reeded edge, PCGS graded AU55. According to Pridmore, "This is a machine trial by J.Watt & Co., Birmingham, from a coining press manufactured by them for the Hong Kong mint and designed for striking the Hong Kong silver dollar."

Estimate: 700-900 USD