I am quite sure about these 2 recent cheap ebay bargains. The keywind which is all original, runs, perfect dial, missing plate screw is first Columbus Gruen design with 15j. 1883. The other about 1885 is first lever set adjusted railroad grade. Not original, but proper Deuber case. Dietrich Gruen started Columbus about 1876 at age 21 with Swiss made movements up to about 20,000 serial numbers. Any disagreements or comments very welcome.