See, I probably should have said something what I saw that yesterday, but I'm disinclined to believe it. For one, it's quite unlikely that such a thing as a driver's watch existed quite as early as 1900, being that cars were quite new and rare at the time, thus the market for a driver's watch would be silly small. They generally appears in the early 1920s. Secondly, a proper driver's watch is typically oriented with 12 at an angle between what would be 1 and 2 on a normal face, not just rotated 90 degrees. The movement itself is typical of a pocket watch from the time, the size would be a mid size ladies pocket watch, not to mention it's a basic 7 jewel movement. Conversions where a pocket watch movement was fit into a wrist watch case were quite common come wartime and thereafter, on the basis of the casemaker being Semco, I'm inclined to believe this is another conversion.
Don't get me wrong, it's a neat watch, but I don't think it's at all a 1900 driver's watch.