Looking for some help to ID this hand saw mitre box that I got today. It's pretty old. Here's a few photos. There's a logo in the middle of the ruler but half of it is rubbed out so I can't make it out completely. It's a shield. At the top, outside of the shield it says Registered. On the top inside of the shield it says Union Made. On the outside right lower side of the shield it says Label. Then there are vertical lines on the inside of the shield with some writing that I can't make out. Looks like there is an A, M, and maybe an F or a B.
Any help would be greatly appreciated.