The original F.H. Sprague Co. factory, located at 108 East Main Street, Orange, MA. They also produced Kno-Wet trousers, Railroad Trousers, and Sprague's Junior League Suits. Another photo of the factory, from 1905, can be found here.
A sample of the label found inside Sprague's vests.
A 1904 ad. Bill Sewall (William Wingate Sewall) was a long time friend of then president Theodore Roosevelt. The two met in the 1870s, when Sewall and Wilmot Dow served as hunting guides for a young Roosevelt. Sewall and Dow later managed Roosevelt's Elkhorn Ranch in the Badlands. More on Sewall and his relationship with Roosevelt can be found here.
Ad from 1907, showing the standard sleeveless double breasted model.
Ad from 1909, targeted at the railroad market.
A heavily worn Russian vest makes an appearance in the 2009 film "Get Low", worn by Robert DuVall's character, Felix Bush.