The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Caernarvon Castle. Interior Looking West. H. M. Office of Works
Caernarvon Castle. Interior Looking West. No. 7. H. M. Office Of Works
Caernarvon Castle. Interior Looking West. Rembrandt Intaglio Printing. H. M. Office of Works. 1926
Caernarvon Castle. Interior. Looking West. Ministry of Works. Crown
Caernarvon Castle. Interior Looking W. H. M. Office of Works. No 7