If you study all the ads for ladies' models during that time period, you will find that they changed very little. I'm not saying there are absolutely no exceptions (I can think of one), but the general rule is that a ladies' watch that looked a certain way in 1925 looked exactly the same way by the end of the decade. We have few ads for ladies' watches dated 1930, but of the few we have, you can see that the Bernice, Lenore, and Madeline look essentially identical to their 1920s versions. The ads we have for the remainder of the 1930s show the same trend in ladies' models.
I suspect, but certainly cannot prove, that your watch had black enamel, which would have nicely set off the very detailed engraving. That approach would have been perfectly consistent with the time period and with other ladies' watches that have black vs. colored enamel.