I am not familiar with timeshops & without knowing which factory makes their watches, your question may provide a more useful response if directed solely at those who own the same watch. In general, flashed (or whatever marketing spin the rep seller wants to use) gold tends not to be very long-lived. The only sure-fire way to keeping the gold looking like gold (as opposed to its underlying base metal) is to keep the watch clean & in a case (never worn).