The Last Drop Centenario Tawny Port Duo - The Last Drop Centenario Tawny Port Duo were selected and blended for the Last Drop by Cristiano van Zeller, a wine-maker and descendant of the 18th century van Zeller family, among the oldest families in the port community. The Last Drop Centenario Tawny Port Duo is the 11th release for the Last Drop. The duo comprises two old ports from both the same estate but separated by a hundred years. Only 770 are produced.