This is a vintage Japanese-crafted pocket knife made in Seki, Japan by Seizo Imai for Blackjack Knives. This Mamba features a beautiful stag handle. Seizo Imai was one Seki, Japan's finest craftsmen and most famous knifemakers of the modern era. His collaboration with Parker spanned nearly two decades. He made knives for Parker, Frost, Browning, Explorer, Compass, Condor, and many others, including his own brands Imax and Seizo Imai. His custom Loveless style knives are works of art.