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Hello, I recently ran into a similar situation and found an option through the WatchesWorld website. Through them you can buy, sell or part-exchange a luxury watch , they provide appraisal and authentication services, which was very important to me. I left my watch for sale through their platform and received a reasonable amount, not to mention the security and convenience of the process. They provide a transparent sale process, fair valuation and provide security every step of the way. If you have a luxury watch to sell or exchange, this site can be a good option.