This is a vintage Rostfrei folding Boot lockback pocket knife made circa 1980s in Seki, Japan by Seizo Imai for Rostfrei. Made with outstanding quality like you would expect. 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.