Another of the triangle sapphire watches. Interesting as the movement is 1930 but the case is 1933. The other example I have of rhis the case/movement are both 1929.
The watch is a Doris.
I mentioned to you that there is more to tell about the case serial numbers. One of the things is that Bulova started the year 1930 with a 3, not a 0. This Doris is an example. You can easily check it yourself with the search function in this database: there are no watches starting with 000. But there are a few with 300 and they are all Art Deco models not available anymore in 1933. Like this Doris. After the initial 300 series, they did switch to using the 0 for the year 1930, hence you will find cases starting with a 0 as from 002.....
And there are more exceptions.
Another pretty Doris! I will go with Alex's date as an exception to the rule.
1930 Bulova Doris
1930 Bulova Doris
1930 Doris.
Beauty!