The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Bolton. Anonymous Cylindrical High Aperture. c. 1881. First Print. NWPB Series 4
Bolton. c. 1881. Anonymous Cylindrical High Aperture. Calendar Print. NWPB Series 4
Bolton. Anonymous Cylindrical High a Aperture. c. 1881. Calendar Print. NWPB Series 4
Bolton. Anonymous Cylindrical High Aperture. First Print
Anonymous Cylindrical Low Aperture. Keswick c. 1885. NWPB Series 3 d. Andrew Handyside
Anonymous Cylindrical Low Aperture Cast by Andrew Handyside and Company of Derby. Second Print. NWPB. Series. 3. d