If a quality mark is printed, stamped or branded on any article itself, the person so applying such mark shall also apply a trade-mark duly applied for or registered to him under the laws of the United States.
If the person so applying such quality mark is the manufacturer of the article and has sold or contracted to sell such article to a jobber, wholesale or retail dealer regularly engaged in the business of buying and selling similar articles, this section shall be deemed to be complied with if a trade-mark duly registered under the laws of the United States to such jobber, wholesale or retail dealer is applied to such article.
A manufacturer of an article may also mark on the article, in addition to the marks herein specifically required, numerals intended to identify the article or the design or pattern used in such article if such numerals do not appear or purport to be a part of the quality mark and are not calculated to mislead or deceive any person into believing that they are a part of the quality mark.