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Here is an interesting one sporting a running center sweep second hand 10AN dated 1930. Case measures 25.5mm with 15mm lugs. Inside of 3 piece case is marked BWC Co. in a dogbone (Brooklyn Watch Case Co.) with "Monarch" underneath, which signifies 20 year warranted gold plate.
We have identified 2 of these dated 1931 and 1932 in the identical case, but interior marked "Bulova" as Nurse's Watch. The 2 previously ID'ed have radium dials and hands.
This example has the same case shape, dial font, hands and basic layout as two models dated 1929 and 1930 currently in the unknowns.
These two are very similar and housed in BWCC cases marked "Conqueror", which is the next higher grade of gold plating. The BWCC link to Bulova was discussed in depth in these 2 threads.
As far as I can tell, subject watch has the lowest serial number for a 10AN center sweep yet documented to the site. It is mounted on a period leather band that it has been paired with for a very long time, probably since Sally was wearing it.
Unless there is another suggestion, I believe this to be a 1930 Nurse or "Nurse's Watch", which is seen in one ad dated 1931, showing the face seen on the two models dated 1931 and 1932..
EDIT - inserted new ad from Dayton Herald 1931.