The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
The British Museum. Viking Gold. Henry Stone
The British Museum. Viking Age Memorial Stone. Henry Stone
The British Museum. Viking Age Memorial Stone. National Museum of Antiquities. British Museum Publications Ltd. Henry Stone and Son Ltd
Drum Shaped Brooch of the Viking Age. British Museum Publications Ltd. Henry Stone and Son Ltd
National Museum of Denmark. Gilt bronze Terminal of the Viking Age. British Museum Publications 1980. Henry Stone Printers. Banbury. V. 2