Country and Region stamps were done long before 1891 out of pride and for advertising there was just a newb that posted a 1700"s era razor yesterday with a "Spain: stamp on it..
You have to be careful though, at that point SPAIN stamp I would guess was of Sheffield origin. ESPAGNE, LISBON, LEIPZIG, AMSTERDAM, HOLLAND, ITALY, PARIS, CUSCO, FRANCE are just a few registered in 1787 directory, all Sheffield marks.