Are you sure this is a nakiri? Because I picked up a Martin Yan "chef's knife" on eBay that was advertised as being from the late 70's/early 80's. It was unused with all the packing slips. The knife was pristine but the wooden handle had discoloration on the brass bolster and pins. It had Japan on one side and Martin Yan in script on the other side with a square black kanji logo. On the opposite end was a hole for hanging. Looks like a wide nakiri or narrow cleaver. The insert says its a molybdenum/high carbon stain resistant alloy blade honed to a 20 degree V-taper with a "rocker shaped cutting edge" and that the manufacturer is MAC Knife Inc.