1922 Illinois, Bunn Special, Model 11, 23J, 16S, lever set, stem wind, railroad grade, 6 adjusts, double sunken Montgomery dial, 48hour motor barrel, double roller with date serial number 4137217. RARE, only 12,370 of this model was produced during 1922, you have to wonder how many still exist. Superb case, great dial. Currently not working, the mainspring is broken, balance staff ok. It will need a repair to get going. The gold plated case is 50mm in diameter. With a repair, the new owner will have a cracking pocket watch.