I found this Big Fine Razor in an antique (junk) store a couple of days ago. The blade is 7/8, the spine is 3/16s. Heaviest razor I've seen yet. No makers or proof marks at all. When I started to give it the arm hair test, it started popping hairs before I got to the skin. This sucker is sharp! Shaves nicely, too, but I will have to get used to handling such a big razor...