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When I bought this watch I couldn't quite make out the date code but I figured early 1940s Bulova Dean. To my great surprise, I found once I got the jelwer's loupe out that it appears to be a 1938. Its the earliest one I've ever seen.
I've attached an ad from the site and it also looks just like the 1939 on the site (indeed, the design doesn't seem to have changed much year to year).