I just couldn't resist a peak into the lounge...amazing what one can accomplish nowadays with a laptop and a wireless coffee shop!
Here are my observations:
Firstly, the case number engraved on the cuvette, which matches the outer cover, has only 4 digits. Even if we start with the assumption that the date attributed to this watch is accurate, it should then have a 5 digit number. If the owner is in error and we judge by the movement's date, it should have a 6 digit number.
Second, the name of Vacheron without Constantin is improper for the period. Those very few Jean Marc Vacheron watches that were singularly signed came and went much earlier.
Then if you examine the style of the cuvette engraving, you will notice the poorly executed "Vacheron" label, which is inconsistent with the fairly good quality of the remainder. I suspect the case was contract manufactured for whatever retailer who purchased to add their name upon delivery.
Of course, the hallmarks are not for Vacheron.
On to the movement; one would expect the standard bar calibre of the period. What we have presented to us is a more modern, circa 1905, anonymous movement.
As Bill also pointed out, the decoration is very American although I have seen Swiss import movements, including Vacheron, given American-style decoration, although a bit more subtle.
The prettiest part of this piece is the case decorations, supposedly enamel hand-painted scenes with inset stones and pearls. The work, to my eye at least, copies in certain areas the technique of enamel over guilloche but looks to be more like paint over foil which was used to embellish less expensive watches. If this is true, I might also suspect that the very pretty painted scenes are actually decals; again commonly used for less expensive items.
Cheers from the coffee shop