Gibraltar 1786 entire to London via Spanish overland routeGibraltar 1786 (24 Sep) entire letter from Gibraltar, addressed to the famous naturalist Sir Joseph Banks [then president of The Royal Society], London, sent by the Spanish overland route, with a fine strike of the rare "ANDALUCIA VAXA" handstamp in black on face. Rated "8"(d) on arrival, with very fine "OC 20" Bishop mark on back flap (which would open out for display). Sir Joseph Banks accompanied Captain James Cook on his first great voyage from