This prompted some searching on my part because I am going to need to come up with a crystal for a 1904 pocket watch at some point. If a local jeweler can't do anything, it looks these guys make custom watch crystals for "oddly shaped watches." They may be able to duplicate a Scott crystal window if you took it out and sent it to them.

https://watchrepairco.com/services/watch-crystal-replacement/

Good luck and please post if you find someone and get something you are happy with.