This is a simple 12s, 17J Illinois, whose movement is a grade 255, model 1 from ca. 1916. The movement is a special label marked Laclede. It has what I think is very nice damaskeening and is housed in a case marked Monitor, likely by the Illinois Watch Case Company. Larry Treiman discussed the significance of the name Laclede in an earlier thread. Illinois watch question Jim Carroll’s Illinois 12s website mentions that the name refers specifically to the Laclede Watch Co. of St. Louis. I managed to find a couple of advertisements by the Laclede Watch Co. One (see link below) was in the advertising section of the June 1913 issue of Popular Mechanics. The other was also from 1913, but I may not link to it. However, the gist of the ad is the same as that in the Popular Mechanics ad. Popular Mechanics I wonder whether the Laclede Watch Co. might have been established specifically to market Illinois pocket watches, similar to the Leonard Watch Co., which seems to have marketed only New Haven pocket watches.