I guess I already started by saying I don't think this is the right crystal, but it seems to fit well and sure looks cool! Both movement and case back are stamped L5, leading me to believe this is a 1955, but I leave that for the panel to decide. I've looked through all the '50's watches that are posted and all the ads, the best I can come up with is it looks most like a '53 Ambassador A with different lugs. Also kind of looked like a Senator in one of the ads. I wore this around all day and forgot I had it on, so light and comfortable. Kept awesome time too! Whatever it's title is I'm calling this one A Keeper. It's funny how you fall for a watch.
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Pretty sure this is not the proper crystal. 23mm by 20mm