The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Liverpool. Mersey Tunnel. Photochrom. 1951
Liverpool. The Mersey Tunnel. Photochrom. No 75600
Liverpool. The Mersey Tunnel. Photochrom
Liverpool. Entrance to the Mersey Tunnel. 85941. Photochrom. 1953
Liverpool and Birkenhead. Interior of Mersey Tunnel Under the River Mersey. Mersey Tunnel Junction Chamber Showing Main and Branch Tunnels. Valentine. RP
Mersey Tunnel. Liverpool. Liverpool from the Mersey. Tunnel Entrance. Multi View. 1954
The Mersey Tunnel under the River Mersey. Liverpool. Interior of Mersey Tunnel. Ventilating Shaft at Pier Head. Valentine. RP. Multi View. 1939
Mersey Tunnel. Entrance to Mersey Tunnel. Liverpool. Multi view. Valentine. RP