I don't know where my Dad's been hiding this, but it arrived in the post today!
Smiths, 17 Jewels, Incabloc, Swiss Made on the dial
Anti-Magnetic, Incabloc, Waterproof, Swiss Made, Stainless Steel Back, on the back which has been worn down a little by a military type of strap.
It's a hand-wind and running quite nicely, the chrono also works with the seconds indicator perfectly returning to the 12 o'clock position on reset
I don't have the tools to take off the back and don't want to risk trying with a pair of long nosed pliers. I'll post pics once I've the correct tools.
I know it's not much info and a movement pic is invaluable, but does anyone know a rough age for this one?