I'm curious when lockback knives as we know them today were actually invented. I kind of got the idea from wikipedia that Buck Knives invented the modern lockback with the 110 Hunter, but in retrospect that might be total horse manure. The Mercator K55K has supposedly been in production since 1867, and it uses a modern style lockback system. So, has the K55K been changed since 1867, or were lockback knives around well before the 110 ever existed? And by "lockbacks" I mean the type as used on the Buck 110 and other modern knives, not rachet locks or picklocks, or other types like they used on najavas, etc.