I've been doing some research into the GS watches of the 1950's, ie. the Omega '53, Smiths GS Deluxe, etc.
The following text is a timeline of events and discussion which follow up to the procurement of these watches. It is largely centred around Smiths, but there is mention of other watch types, so have a read if this sort of thing interests you. I have added a few notes at the end, with just some of my own speculation.
I'd appreciate it if you did not replicate the text elsewhere, but I'm happy for it to be copied onto other websites if you ask me and reference it. I usually wouldn't be too bothered about stuff like this, but it did take me a lot of time and effort.