California Code
ARTICLE 1 - Watches
Section 21501.

21501. Except as provided in this article “secondhand watch” means any of the following:

(a) A watch which, as a whole, or the case thereof, or the movement thereof, has been sold to a consumer.

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

(Added by Stats. 1941, Ch. 50.)