One of these special models was the 1941 Myron. The yellow gold filled model was produced through 1951 - although the coral gold version is much more scarce.
The dial is sterling silver and either finished in a two-tone butler / white finish or the pink coral finish. The yellow-cased Myron has solid 18K yellow gold numerals on the dial. The coral gold-cased models also have solid gold numerals but they are rhodium plated to look like white gold.
I recently picked up a coral gold Myron - it was in excellent shape though it looked a little funny with very thick, curved crystal that gives the watch a gold fish bowl effect. It's so thick that I think it actually protected the case from excessive wear.
I've restored a number of Myrons over my experience collecting Hamiltons. The Myron is a good sized watch for a model from this period. The 14/0 movement is compact enough to outfit some very small men's watches. Even though the Myron is small by today's standards, it's a large watch compared to it's peers.
Here's an example of a yellow-cased Myron I restored a while back. The before shot shows you the typical wear pattern to the lugs. And as you can see, the dial was a complete disaster and needed to be redone. The watch had nice hands though - so it had that going for it.
The after-shot with a fresh redial, new glass crystal and polished case shows what a little TLC can do for a vintage watch. Definitely a keeper!