Any person who sells a second-hand watch shall deliver to the vendee a written invoice, setting forth the name and address of the vendor, the name and address of the vendee, the date of the sale, the name of the watch or its maker, and the serial numbers, if any, or other distinguishing numbers, or identification marks on its case and movement. If the serial numbers, or other distinguishing numbers, or identification marks, have been erased, defaced, removed, altered, or covered, this shall be set forth in the invoice. A duplicate of the invoice shall be kept on file by the vendor of the second-hand watch for at least one year from the date of the sale thereof.
73 P.S. § 242