There were just over 7,000 of this variant made making it a very rare "Veritas". In 1915 this was the top of the line in Railroad grade pocket watches.  The Montgomery dial and NOS hands really set it off. This watch runs, winds, and sets just as it should. I kept it running for a couple days and it seems to keep time. However, I do not know this watch's complete history. That being said, assume this watch needs serviced. I don't know. how accurate it is. What I do know is that it is set up very nicely with the 'Montgomery' dial and that beefy case. You don't want to miss this one. Here are the dimensions and weight :

Size : 16s
Case:  Open Face, both covers screw on/off
Crystals: NOS Glass
Maker: Elgin
Material: Nickle plates w/ gold train
Weight :98 grams
Outside D :51 mm