Quote Originally Posted by Sinnlover View Post
I have JLC GSTP somewhere.
I've just checked and apparently I've got 14 including both white and black dial Cyma & JLC . £95 sounds OK if it's working. I think they were issued earlier than 1939 though that may be reading too much into the source below which mentions 1936-37.

https://www.royalsignals.org.uk/photos/watch.htm

There really is not a lot of data out there on these.