This is a vintage knife made in Seki, Japan by Seizo Imai for Five Star circa 1970s. Marked "Five Star S.A.B. JK-250" on the front of the blade, and "440 Stainless Steel" on the back. Handle is bone with brass bolster and stainless steel blade. 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. The handle is a natural material and will vary from knife to knife. Stock photos.