The BULOVA "DUNCAN," Circa 1948/50. (Have images of one '48 & '50 manf. examples... Released in 1949, as per the display ad illustration?) Solid 14 karat yellow gold case. Original price: $135.00.
Thanks to Jerin, for contributing the (illustation verified) model ID :-)
I also verified the crystals, as such... (i.e. clearly designed to fit the lines of the case!)
Best :-) Scott