6. Provided always, and it is hereby further enacted by the authority aforesaid, That the master or other person taking charge of such ship or vessel shall produce to the proper officer of the customs in the colony or plantation where he shall arrive a certificate, under the hand and seal of the collector or other principal officer of the customs in the port where he shall have fitted out, that oath hath been made before him by the shipper of such provisions, hooks, lines, netting, or other tools and implements, that the same are of the product and manufacture of _Great Britain_ or _Ireland_, or the _Isle of Man_ respectively, as the fact may be, and that the several articles before mentioned, (except the provisions), specifying the quantities and particulars of each sort, are to be used in the fishery by the crews of the respective ship or vessel carrying out the same, and by the craft belonging to and to be employed by such ship or vessel in the said fishery, and for no other use or purpose whatsoever, (which oath and certificate such collector or other officer is hereby authorised and required to administer and grant without fee or reward); and on failure of producing such certificate, or if any such hooks, lines, netting, tools and implements, are used or disposed of for any other purpose, the same, and the ship or vessel having the same on board, shall be liable to be seized and forfeited in the same manner as they would have been subject and liable if this act had not been made, any thing herein contained to the contrary notwithstanding. [Sidenote: No fishing ships, or any craft carrying necessaries for the fishery, to be liable to any restraint as to time of working, nor to make any entry at the customhouse, _&c._]