I have a Bufalo pistol made by Gabilondo y Cía. Like the other Bufalo's I have seen while researching this one, it is marked Made in Spain, Automatica Espanola - Pats 62004 Y 67577, "Bufalo" 765 (.32 cal.). There is another number above the trigger which is 16571. This gun has some kind of gold engraving all over it. Is this anything special?