I have always loved the detail and beauty the watch companies put in their artwork and advertising drawings back in the day. Elgin watch company made some very nice detailed movement drawings with see through sections giving you a peek of what's inside. In fact I had a few framed drawings from Elgin back in the 1980's that I bought at a flea market called Shupps Grove in Adamstown, PA. I donated them to the NAWCC museum back then.
There is a huge framed drawing of a railroad movement from Elgin on display at the NAWCC museum similar to the small versions I had donated; if you visit the museum look for it. It's a true masterpiece!
Keep those watches ticking,