I was asked what who where on this one ( Its not mine) Iv'e never seen anything like it and can find nothing online. Any ideas? It has an E on one side and 7333E on the opposite side.
It's what you said, a square socket for a brace. The "E" in a circle is Eberhard Mfg. Co's logo. 7333E is their catalog number.
Thanks Bus!
Technically it's a lag screw driver.
Here's a scan form the listing in Eberhard's No. 9, 1922 Catalog
Number on your socket is probably7388E.
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/eberhard-catalog-brace-sockets.jpg)
A handle adaptor...hmm...now that's interesting...
Many thanks Bus! You are right on the numbers. Hard to read through all the paint.