The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
National Maritime Museum. The Time Ball Signal. Old Royal Observatory. Larkfield Printing. Her Majesty Stationery Office. Card No. 238
The Time Ball Signal. Old Royal Observatory. National Maritime Museum
Greenwich Mean Time. Old Royal Observatory. Larkfield. National Maritime Museum
Canada. Toronto. City Halls. The Old. Royal Specialty Sales. Plastichrome by Colourpicture. Multi View
National Maritime Museum. Greenwich. Old Royal Observatory. Time Ball and 24 Hour Clock. Crown
Aldwych and Stratford upon Avon. Dorothy Tutin as Kate and Colin Blakely as Deeley in Harold Pinter Old Times. Royal Shakespeare Theatre Series. Nr. 109. Zoe Dominic. 1971
National Maritime Museum. The Old Royal Observatory. W. S. Cowell
