All About Pocket Knives

My buddy has a boker knife it has a yellow handle and three fold out blades no #'s on it anywhere just says BOKER USA on it. We know it is old b/c he inherited it from his grandpa just wonderin if anyone could point me in the right direction. THANKS

need pics of the entire knife, closed, open, closeup of tang marks.closed length. maybe we can help then.