Case measures 43mm lug to lug x 24.5mm using Calipers. Original White Dial shows applied Gilt Arabic numerals and Bulova signature, track are printed in Black. Caseback is Gold and stamped as shown. Vintage display ad Dated 1939.
1939 Montgomery from me too. The circular scrape on the dial.... I got a charcoal dialed watch a couple years ago and upon arrival, it looks like the seller (or someone before him) had actually taken a black sharpie and just "colored in" the scrape. I'd much rather have the scrape than the sharpie repair. Nice watch! Is the case 10K Gold Filled?
Other 1939 ad snippet below. Click on graphic for full ad.

There's another 1939 ad here: http://www.mybulova.com/sites/default/files/vintage_ads/bulova-ad-1939-8.jpg