All eggs offered for sale at retail shall be properly classified in accordance with the following specifications:

(1) A heavy cardboard or placard, not less than eight by eleven inches, shall be conspicuously displayed at all times on or over each receptacle containing eggs offered for sale, setting forth in letters not less than one inch in height, plainly and legibly, the classification as to quality and weight;

(2) The name of the state of origin of eggs may appear on the placard;

(3) The placard shall not be required when eggs are packed in properly labeled cartons. The eggs therein shall be required to come up to the standard as placarded; and

(4) Restaurants, hotels, or other eating places shall be required to display a placard where it can be easily seen by customers or, in lieu thereof, to place this information on the menu.