David, I think these lamps were also used in the towers on the BCATP bases for signalling aircraft.
I have a double one (red and green lens) I believe was used in the Oshawa tower (EFTS #20) and postwar. The two lamps themselves are Ref. No. 823, the red lens cover is Can. Ref. No 5A/1152 and the green lens cover is Can. Ref. No.5A/1320.
Currently on Kijiji there are 2 listed for sale in Ontario.
https://www.kijiji.ca/b-ontario/aldi...0l9004?dc=true
Brian