Section 80. Whoever furnishes or sells to any minor any article of any description with the knowledge that the minor intends to sell such article in violation of any provision of sections sixty-nine to seventy-three, inclusive, or after having received written notice to this effect from any officer charged with the enforcement thereof, or knowingly procures or encourages any minor to violate any provisions of said sections, shall be punished by a fine of not less than ten nor more than two hundred dollars or by imprisonment for not more than two months, or both.