What time is it? Watches and horology

Putting this out there...

Does anyone know anything about Vertex watches? I was given a Vertex Allproof that my Grandfather was given in 1954. It is kind of like this but with a slightly different face (and it has a modern strap) http://www.ebay.com/itm/Vintage-mens-9ct-gold-vertex-allproof-revue-77-movement-fantastic-condition-/390566833959?pt=UK_Jewelery_Watches_Watches_MensWatches_GL&hash=item5aef98ef27http://rover.ebay.com/roverimp/1/710-53481-19255-0/1?ff3=2&pub=5574889051&toolid=10001&campid=5336525415&item=390566833959&mpt=3284489

I'd like to learn more about the history if possible - they seem to be well regarded but there is very little info about them that I can find on the net.

Cheers

All I know is that they were one of the companies that made the WWW watches for the military.