The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Double Aperture box. Preston. e. 1935. MacDowell Steven. NWPB Series 5. 1981
Preston. Double Aperture. Calendar Print. NWPB Series 5. 1935
Preston. Double Aperture. c. 1935.First Print. NWPB Series 5
Preston. Double Aperture. First Print. Series. 5. a
Preston. c. 1935. Double Aperture. First Print. NWPB Series 5
Post Office Archives. Design for an Improved Letter Box. T. M. Baynes. 1857. Multi aperture pillar box. Post Office Archives. 1989. Larkfield
