§ 232. Trade mark. If there is any quality mark printed, stamped or branded on the article itself there must also be printed, stamped or branded on the said article itself the following mark, to wit: a trade mark duly applied for or registered under the laws of the United States of the manufacturer of such article; except that if such manufacturer has sold or contracted to sell such article to a jobber, wholesaler or retail dealer regularly engaged in the business of buying and selling similar articles, this provision shall be deemed to be complied with if there is so marked on the said article the trade mark duly registered under the laws of the United States of such jobber, wholesaler or retail dealer respectively; and in such event there may also be marked on the said article itself numerals intended to identify the article, design or pattern provided, however, that such numerals do not appear or purport to be a part of the quality mark and provided that they are not calculated to mislead or deceive anyone into believing that they are partly of the quality mark.