This is a vintage all-steel Japanese multitool, typically dating from the 1950s to the 1970s. These tools were frequently manufactured in Seki, Japan, a city renowned for its long history of high-quality cutlery and tool production. eBay +2 Key Features Integrated Adjustable Wrench: The most distinct feature is the “monkey wrench” style adjustable jaw at the base, operated by a knurled thumbwheel. Stainless Steel Construction: Most models from this era are stamped “Stainless Japan” or “Japan” on the base of the main blade or on the handle. Blade & Secondary Tools: It usually includes a primary folding knife blade and often hides other fold-out tools like a file, screwdriver, or bottle opener within the handle