Mich. Comp. Laws § 445.551

Sec. 1. For the purposes of this act: "Consumer" shall mean an individual, firm, partnership, association or corporation who buys for own use or for the use of another but not for re-sale. "Second-hand watch" means: (1) A watch which, as a whole, the case thereof, or the movement thereof, has previously been sold to a consumer: Provided, however, That a watch which has been so sold, and is thereafter returned within 60 days from the date of such sale, either through an exchange or for credit, to the same person who sold such watch to the consumer, shall not be deemed to be a second-hand watch for the purpose of this act, if such person keeps a written or printed record setting forth the name and address of the consumer, the date of the sale to the consumer, the name of the watch or its maker, and the serial numbers (if any) on the case and the movement of the watch or other distinguishing numbers or identification marks, the aforesaid record to be kept for at least 3 years from the date of the sale of the watch and to be open for inspection during all business hours by the prosecuting attorney of the county in which such person is engaged in business; or (2) Any watch whose case or movement, serial numbers or other distinguishing numbers or identification marks have been erased, defaced, removed, altered or covered.