Alex Hamilton’s seventeenth lesson is a beginner’s guide to strategically purchasing watches for repair, focusing on minimizing financial risk and maximizing learning. He advises starting with complete, working movements rather than “movement-only” listings, as matching cases to loose movements is technically difficult and often impossible due to precise dimension requirements. The tutorial compares the advantages of standardized American pocket watches and accessible Seiko movements against the challenges of poorly documented vintage Swiss pieces. Hamilton concludes by recommending that new watchmakers practice on modern, affordable movements like the NH36 to perfect their cleaning and lubrication skills before tackling complex vintage restorations.