I was putting together a presentation a few years ago on early railroad watches and was trying to figure out how to classify them The canonical railroad watch is an open face,stem wind lever set watch. However, those did not exist when timing first became an issue for railroads and all available watches were key wind. In a key wind watch it is no big deal about open face vs hunting case since it is a simple matter to change the location of the winding holes and rotate the movement in the case to put the pendant at 12:00 for an open face instead of 3:00 for a hunting case. When stem winding was introduced, it was a while before the first stem wind open face watches appeared. For Waltham, the first was the 1879 model. Before that if you wanted an open face watch you either had to have a sidewinder with the stem at 3:00 or a conversion dial with the seconds bit moved to 3:00. Waltham made some 1872 model watches in open face, but those came after 1879. When the open face became generally available, Waltham was still reluctant to make the open face watches have lever setting. The 1879 model and 1883 model open faces watches were generally pendant set while their hunting case counterparts were lever set. The 1872 models were all lever set in both configurations but were 16 size when the preference for railroad watches was 18 size. Once it was introduced the 1883 model was a great success, but it still was pendent set on most of the open face grades. Since Illinois used the 5th pinion to generate their open face watches, there was no issue with them having lever set on all of those. Waltham did put lever setting on a few of the open face 1883 models, so it was not a design issue. I have always wondered what the reasoning/thinking was behind those design/marketing decision. Does anyone else wonder about these why's?