Hamilton had all sorts of stylish watches in a variety of grades and some of the ultra-thin models were in the Thinline lineup. A good example is the 1962 Thinline 4003. The Thinline 4003 was only produced for two years.
In person, the Thinline 4003 is very cool looking watch. I love the funky hour hand and baton minute hand!
I recently purchased a project watch and it was in great shape. All it needed was a fresh overhaul and a strap. It's interesting to see how the catalog's artistic representation has a slightly different crown than the real watch. I know mine is correct because the case has stem tube that protrudes so the gasket in the crown can provide a waterproof seal.
Under the dial is a 17 jewel 687 movement. The outside circumference of the watch movement is tapered or beveled to give it the ability to fit into a very thin case.
The dial is super nice too with a gold band going around the perimeter. It gives the impression of a large reflective ring inside the crystal, but it's really a part of the dial.
The overhaul went great all the way up to my installing the screw into the mainspring barrel arbor - and then I broke it off! %^&%*!!! I was able to back the broken part out of the arbor - but now I need a new screw so that I can wind the watch.
I reassembled it and it looks fantastic - but, alas, it will just have to wait until I get a new screw for the ratchet wheel.
I happened to score another 4003... this one came in it's original box with it's original bracelet... sweet!