The Omega 53 is a nice size. I've owned two, or it could have been three, in the past.
There are a couple of good articles by Ken Gordon in the Horological Journal 2012, part 1 in October and part 2 in November. Part 2 includes a picture of the MoD/Omega order. I have a printed copy if you can't find it. It's also featured on pages 685 to 688 of Konrad Knirim's tome.
They were worn on stainless Bonklip bracelets. I've never liked Bonklips so have always put them on NATOs.
I like the early canvas NATOs:
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