No dealer in beverages shall post or place about the premises any sign or signs containing the name of any prohibited liquors or beverages or indicating that any prohibited liquors or beverages are kept on or about the premises for sale or other disposition. Any person violating any provision of this section shall be guilty of a misdemeanor.

In case of any charge or prosecution against any dealer in beverages for violating the law against selling, offering for sale, or keeping for sale or otherwise disposing of prohibited liquors and beverages, it shall be competent to make proof in the action that the party had posted such signs on or about the premises.