A vessel shall not be required to be numbered pursuant to sections 37-1201 to 37-1273 and 37-1291 if it is: (1) Already covered by a number in full force and effect which has been awarded to it pursuant to federal law or a federally approved numbering system of another state; PROVIDED, that such boat shall not have been within this state for a period in excess of sixty consecutive days;
(2) A vessel from a country other than the United States temporarily using the waters of this state;
(3) A vessel whose owner is the United States, a state, or a subdivision thereof; or
(4) A ship's lifeboat.
