Blade edge: 55mm ? No damage to the platform. Maker's mark: Unknown. If you could tell me how to read it upon purchase, I would appreciate it. It was included when I received a collection of Kanna (Japanese planes) such as Kinshiro, Tengu, and Toshinari, so I believe it's a usable mark. Please assume it needs to be sharpened. There may be dirt, rust, chipping, and wood splitting. Please examine the images carefully to assess the condition. I will ship it the same day or the next day. Thank you.