Whilst the BBC was broadcasting and recording many of the momentous events of World War 2 using the STC4017C, and American radio stations continued to use the original trusty Western Electric 618A, out on the high seas the British Royal Navy were issuing orders and communicating using the Vitavox Admiralty Pattern No 1359.
Because it looks very similar, I had previously thought that the Vitavox was simply a re-badged STC, but this is not the case. Having finally managed to unscrew the grills on both it is easy to see key differences.
The Admiralty Pattern No1359 is also mentioned in the Australian Royal Navy Fleet Orders for 1945 for use with radio & disc recording equipment. It is suggested here as an inferior alternative to the STC4021 (which has a much flatter frequency response).N.B. Coarse groove, direct cut, disc recording equipment was used extensively by broadcasters and the military throughout WW2.