I found this No. 1710 brace at a ReStore a few weeks ago, brand new in its original box! It also happened to be one of the store's 25 percent off days, so I couldn't resist it. It was like being able to go back in a time machine to an era when you could buy one of these new off of the shelf!
From the sticker, it was distributed by the Commonwealth Premium Co. Ltd. I can't find any information on that business.
Turns out, I already had one of these models, but not brand new in the box:
According to Old Tool Heaven, the No. 1710 was a re-branded Mohawk-Shelburne made from 1935 to at least 1981. When Millers Falls acquired Goodell Pratt in 1931, Mohawk-Shelburne Millers Falls was part of the deal.
MF subsequently used the Mohawk-Shelburne name on their line of economy tools. Below, my example of this make. You can easily see the resemblance with the Millers Falls version.
(The round wooden pad on the end of the brace is called a "head", and it was missing on the brace above. Traditionally, these were made of rosewood. Not having any of this material laying around, I turned one out of maple.)