From website http://panoramaeast.org.uk/panorama/north/135: "The name of the former pub celebrates a Prince of Orange (the Graf Moritz) who helped the English to defeat the Spanish in 1600 at the Battle of Nieuwpoort."
William G. Crow was the publican there from 1884 to sometime between 1895 and 1899. I think this excelent website is the source of your image:
https://pubshistory.com/LondonPubs/Whitechapel/GraveMaurice.shtml