Oregon Revised Statutes Occupations and Professions § 695.210

(a) A watch which, as a whole, or the case thereof, or the movement thereof, has been sold to a consumer. However, a watch which has been so sold, and is thereafter returned within a period of six months from the date of the original sale, either through an exchange or for credit, to the same person who sold the watch to the consumer, shall not be deemed to be a secondhand watch for the purpose of ORS 695.210 to 695.240 if the vendor keeps a written 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 number, if any, on the case and the movement of the watch, or other distinguishing numbers or identification marks, such record to be kept for at least three years from the date of the sale of the watch.

(b) Any watch whose case or movement, serial numbers or other distinguishing numbers or identification marks have been erased, defaced, removed, altered or covered.