Elgin Keyless Works

There's some nice articles over at pocketwatchdatabase.com on the winding/setting mechanisms of  Elgin's convertible 18 size grade 100, and 16 size model 5s.

https://blog.pocketwatchdatabase.com/2021/01/12/charles-p-corliss-1885-patent-winding-and-setting-mechanism-inspecting-an-18-size-elgin-convertible-grade-100/

and here

https://blog.pocketwatchdatabase.com/2021/01/14/charles-p-corliss-stem-winding-and-setting-mechanism-on-the-elgin-16-size-model-5/