From what I know the rest of the plates are at British museum of stamps. The head is not on this plate because from what I read, the stamps were printed in 2 process because of the 2 colours of the stamp.
I have another one with 6 pence Gibraltar. It looks more beautifull in reality. For Romania, Hungary, Austria, Germany, Great Britain we can arrange local pick-up! The item "Original engraving printing plate 2 dollars Edward 1903 Hong Kong China stamp R" is in sale since Saturday, November 10, 2018.
This item is in the category "Stamps\British Colonies & Territories\Hong Kong (until 1997)". The seller is "antic_hun" and is located in Transilvanya. This item can be shipped worldwide.