field telephones

[Godwin Hampton]

Neil,

The F Mk. II were bakelite, and replaced the aluminium Mk.I probably because aluminium was badly needed elsewhere. Even the D Mk V originally had a cast aluminium case, later replaced by sheet steel. I would expect the aluminium ones to have been replaced on the production lines around 1940. They were both pre-war designs, and the F Mk II was still in use in the Sixties. The D Mk.V was used at least for the duration, and possibly beyond.

Hope this helps to make up the picture.