Please note that this is not an automatic knife. It is manual action and requires opening with the thumbnail groove on the blade. The blade locks open and requires sliding the lever to close. This is a vintage Japanese crafted pocket knife made in Seki, Japan by Yasuo Imai, circa 1960s. It measures 4.25" long closed and features a synthetic handle and a stainless steel blade. Yasuo was the father to one of Seki, Japan's finest craftsmen, Seizo Imai. After Seizo's passing, several vintage old stock models were found at his warehouse. This is one of these rare finds.