When sourcing vintage handbags, the material is the primary value driver. For Genuine Leather, verify if it is Full-Grain or Top-Grain to ensure durability and a natural patina over time. If sourcing PU/Synthetic Leather, ensure it meets REACH or RoHS standards to avoid chemical odors and peeling. For fabric-based vintage bags (canvas or jacquard), check the thread count and water-resistance treatment. Always request a material composition report to confirm the hardware is made of anti-oxidation alloys or brass to prevent tarnishing.