New old stock. The last person to touch this razor besides myself is probably dead by now. Lets hope it isn't cursed. Internet research tells me that duridium was a trade name for a stainless steel alloy. The name also pops up as some sort of ore in the star trek universe. Is it a coincidence or are the blades derived from alien technology? Feel free to ask questions, you'll be a star. Let me know if you need more pictures. Check out my other listings and follow me to see the cool vintage stuff I'm selling.