Overdate 1929/1 Hong Kong China British trade dollar silver coin NGC UNC Details. Nice coin with great details and luster, looks better than my photos. Authenticity of the coin is guaranteed. The item "Overdate 1929/1 Hong Kong China British Trade dollar silver coin NGC UNC" is in sale since Tuesday, March 10, 2020.This item is in the category "Coins & Paper Money\Coins\ World\Asia\China\Empire (up to 1948)". The seller is "16or" and is located in West Palm Beach, Florida. This item can be shipped worldwide.