Here's 3 different versions of the Gillette 3 hole blades. The first one was made September 15, 1906 The second one, I have to find the steel lot number for a date? The third one was made the 22nd week of 1925.
I have not opened this blade envelope yet but it's supposed to replicate the picture of the blade on the sleeve with no "Pat date" on it. Was sold as a pre-mass production 1903/04?
These are carbon steel, worthy of being honed and stropped? @Drygulch posted photos of some Wade & Butcher blades on The Haul. I think he said they were curved. Sounds very proprietary. Never saw a W&B DE.
There are two W&B DE razors on EBay right now, both over $110. The blades are not round hole, but have two square holes and a center round one.