SEC. 105. It shall be unlawful for any person to carry under his clothes or concealed about his person, or found in his possession, any pistol or firearms, slungshot, brass knuckles, or knuckles of lead, brass or other metal or material , or any sand bag, air guns of any description, dagger, bowie knife, or instrument for cutting, stabbing or striking, or other dangerous or deadly weapon, instrument or device; provided that this section shall not be construed to prohibit any officer of the United States, or of any State, or any peace officer, from wearing and carrying such weapons as may be convenient, necessary and proper for the discharge of his official duties.