What's a good mechanical starter watch to take apart and put back together? Something inexpensive I don't mind messing up, but with a movement that is a good foundation to master? Thoughts and advice? Thanks!
6309 is a good option, and 7005 is even simpler. Lots of information on the web to guide you, for example or friend Mike_B has very good disassembly/assembly videos of both movements (and many others) on his youtube channel "My Retro Watches", and you can get the technical sheets in this forum.