(a) Except as hereinafter provided there shall be assessed and levied by each city and town in each fiscal year on every vessel, and its equipment, for the privilege of using the waterways of the commonwealth, an excise measured by the value thereof, as hereinafter defined and determined, at the rate of ten dollars per thousand of valuation.
(b) Any person who owns such a vessel on July first shall annually, on or before August first, make a return on oath to the assessors of the city or town where such vessel is habitually moored or docked, or in the case of a vessel which has no mooring or docking space, where said vessel is principally situated, setting forth the vessel's registration or documentation number, if any; an adequate description, as well as the owner's estimate of the fair cash value of said vessel and any engine or motor used to propel said vessel, as of the next preceding July first; and the place of habitual mooring or docking or other principal location of said vessel.
(c) For the purpose of computing the excise under this chapter the value of each such vessel, and its equipment, shall be deemed to be the fair cash value as determined by the assessors of each city and town, but not in excess of the following values: