In this video, we test a rare 20-year-aged Suehiro Maido whetstone against a knife made from Apex Ultra steel — one of today’s finest high-carbon tool steels. See how this vintage stone performs on modern, demanding steel. We’ll evaluate cutting speed, feedback, and finish on the edge. 🔪 Knife: Custom Apex Ultra 🪨 Whetstone: Suehiro Magnesia Maido (20 years aged) A unique combination of old and new — natural aging effects on synthetic magnesia stones are rarely documented, so this test offers a valuable look at how well such stones retain performance after two decades. Subscribe for more rare whetstone and steel pairing tests! Japanese natural whetstones