Whoever commits mischief by destroying or moving any lighthouse or other light used as a sea-mark, or any sea-mark or buoy or other thing placed as a guide for navigators, or by any act which renders any such lighthouse, sea-mark, buoy, or other such thing as aforesaid less useful as a guide for navigators, shall be punished with imprisonment for a term which may extend to 7 years, or with fine, or with both.