Could be a Pexto or Fray and any one of several other makes.
It probably had a hardware store label when sold which is why it doesn't have the makers name.
Sometimes these unmarked ones are lesser quality, but this brace has a closed ratchet
(as opposed to the cheaper open ratchet seen on the Stanleys),
so this one is a better grade tool.
The Stanleys look to be fairly modern. They were still making identical braces in the 1970's.
The bottom brace is a 10" and the other two are 8's. They measure from the centerline of the chuck to the centerline of the throw handle, and double that, which is the total sweep of the brace.
6" to 14" is fairly common.
16" and up or under 6" are both pretty scarce.
I am always looking for a 16". The 16's look really funny wide when you see them.
If anyone spots a freakishly wide brace, cheap??
Of course I'd take a full featured ratcheting 4" just as quick heehehehehe.
yours Scott