A luxury watch collector shares the simple strategy he used to upgrade from a $200 watch to a $10,000 Rolex

Greg Petronzi, a watchmaker and collector, said he thinks of his watches as a separate wealth fund.

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• Greg Petronzi started his luxury watch collection by saving and reinvesting in watches.
• He started with affordable watches and gradually traded up to more valuable pieces.
• Petronzi said he views his watch collection as a fluid wealth fund that's always evolving.

Before Greg Petronzi became an expert in repairing vintage Rolexes...