Every person, firm, corporation, or association guilty of a violation of any one of § 6-11-1 — § 6-11-7 and every officer, manager, director, or managing agent of any person, firm, corporation, or association directly participating in the violation or consenting to it, shall be punished by a fine of not more than five hundred dollars ($500) or imprisonment for not more than three (3) months, or both, at the discretion of the court; provided, that if the person charged with violation of this chapter shall prove that the article concerning which the charge is made was manufactured prior to the thirteenth day of June, 1907, then the charge shall be dismissed.