That is a neat find, elidas.
On the ratchet...
Is it possible that the steel has deformed on either the offset female opening on the ratchet or those handles? What is the outside diameter of the handles? And what is the inside diameter of the female opening?
On the Mossberg sockets...
I don't know if it was in my introductory "Early Roaring 20's" thread, linked
here, or in one of the offshoots dedicated to each of the sets I have in that category, but I have talked about the preponderance of Mossberg-made and marked sockets in other socket sets before. AA's position is that they are all replacements. My position is that they were original. I think that many companies looking to get into the early automobile maintenance tools marketplace may have made their own handles (e.g., ratchets), but relied on Mossberg for the pressed steel sockets. There are several examples, including Smith & Hemenway and Triumph (not the MC company), just to name a couple.
On the brand...
An
Eames Tool Company in Lynn, Massachusetts, was advertising tools in various automobile trade journals as early as 1911 and as late as 1922. The examples I have seen were fairly simple and crude (e.g., a tube-style spark plug wrench), but it's very possible they made other tools, including a ratchet. If so, they may have used Mossberg for third party sockets, put them in the same wood box, and called it a set.