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Heraldry of Malta - Heraldika Maltija
ĦAŻ-ŻEBBUG - CITTÀ ROHAN
The arms show a canting olive branch (zebbug=olive) above the arms of Grandmaster De Rohan.
The previous arms only showed the lower half. I have no idea when the arms were changed.
Literature : Malta - Cities, towns and villages. Poster published by Valletta Publishing, Malta