I recently picked up another 'sing-song' stamp Craftsman tool, this one a framing square.
Astute observers will have picked up the 2 'screws' in the angle of the square.
This is a take-down square. The 2 screws are actually cams that will release the 2 sections of the square. There's also a pin in there which I haven't ever seen in a take-down square. These were prized among carpenters who couldn't fit a traditional framing square in their tool box. The take-down square solves that problem. They are still sought after by collectors and carpenters. Many have been dinged and dented by being pounded back together when dirty or rusty. This one appears to have avoided that while accumulating some rust and light pitting.
Note the different patent date on the back as on the front. Undoubtedly for 2 different innovations used in this square.
The edge view shows that the legs of the square are tapered to become thicker at the intersection and allow for the connection.
After cleaning with the brass wire cup brush.
I haven't attempted to disassemble it yet. I have it soaking with penetrant. I'll try it tomorrow. I'm looking forward to adding this to my tool kit.
I don't know if this tool is pre-Sears or post-Sears. I've recently concluded that the 'Craftsman' name which Sears-Roebuck purchased in 1927 belonged to the G.N. Cushman Co. of Champagne Ill.