This is a vintage folding knife made in Seki, Japan by Seizo Imai circa 1980s and produced for Explorer. Nice action opening and closing. A great little folder. It comes in Explorer box (may not be original but fits well). 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. After his passing, several vintage old stock models were found at his warehouse. This is one of these rare finds.