The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Lancashire. Map. PT19600
Lancashire with Merseyside and Greater Manchester. Map. PT19600. Colourmaster International. Precision
Lancashire. Map. E. T. W. Dennis. 1960
Map of Lancashire. Photographic Heritage. Glenda Hildred
Lancashire. Map. E. T. W. Dennis. Newcolour
Lancashire. Map. E. T. W. Dennis. Newcolour. 1962