These may be chemical stains that occurred during the production process. Most have the date the photo was taken stated on the rear.
15 photographic prints & postcards of the ‘GOLDEN ARROW’ train – job lot
20 x Photomatic Ltd B/W Steam Engine Photographic Postcards GWR , LNER , BR
L&B Album A Photographic Record Of The Lyndon And Barnstaple Railway
5 photographic prints of BEITH TOWN station (North Ayrshire) – job lot
Worth a Second Glance: A Photographic Record of the Worth Valley Railway. 1972
6 photographic prints of trains & locos taken at NEW MALDEN – 1953 & 1959