I have an open face gold lapel/pendant watch formerly owned by my Aunt Belle. There is no name on the face of it, but I found the following markings engraved inside and would like to know what information they hold about this watch:
The name A. Montandon is there twice (in two different places) , B & B Royal, Swiss, 10 1/2, 277429 (I assume this is a serial number, but don't know where to find legend for its age), 15 Jewels, and 3 ADJ. It is of sentimental value to me. If it does not have monetary value, I would greatly appreciate finding out how old it is.