very nice watch, i like the model details and gold work.
Im guessing you looked up the basic history details here :
http://www.nawcc-info.org/WalthamDB/LookupSN.asp
It does have your watch listed in its catalogue. You should check as it shows only 1000 units of your model being made, so its quite rare and a great find. I have a 1908 model for the past 30 years that still keeps good time. About 2000 were made from what the model run shows. Its a great part of the collection, enjoy.