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Thanks. This website has some info on the movement too
https://pocketwatchdatabase.com/search/result/illinois/2843207
I'm mostly interested in what is involved in getting it running properly and suggestions on who could do the work. It's not massively valuable (in the scheme of pocket watches that is) so I don't really want to spend too much by, metaphorically, sending my fiesta to a ferrari dealer!
1879 according to this page - http://www.pocketwatchrepair.com/histories/illinois.html