To practice on initially, you can't go far wrong with a few scrap mechanical watches from ebay. Maybe a couple of pocket watches to start, and of course a couple of my favorites, HMT's and Sekonda, as they have jeweled movements, and clean up well.
Don't pay big money for those, as you can usually pick them up for £10 or less in a non working condition.
Hi, I am a new member. My name is James, but I go by Jimmy. I am a blacksmith, with a love of pocket watches, particularly key winds. I do a little tinkering on watches in my collection from time to time. A good friend, and new member, Sterling, knowing of my interest in watches, sent me this link.