In this photo of RIDGWAY seems to have a funnel seems to be a black funnel with two white stripes and a wide coloured band in between.... could be red or green? Perhaps. She had the name RIDGWAY was taken in 1927 when bought by Cooper, Belfast. From 1955 she owned by Aberdeen Steam Tug Co. and then to Aberdeen Harbour Board.
So we need to have Aberdeen colours on the funnel! Note the building at far right. That has a bit of Aberdeen look about it. Drydocks in Aberdeen back then?
Hmmmm. OK. This thread is asking more questions than it answers! Probably the best drydocks would be at Scapa Flow. We had two large A.F.D. Admiralty Floating Docks at Bermuda during the war. After the war the docks were towed back to the UK. (Before my time.)