Posted 4 years ago
I had posted this four days ago, hoping to get help figuring out how to open it, after a lot of searching I found the U S patent number 338,251. patented March 23, 1886. no mfg. marks or info
U S patent drawing link
To open it you pull out on the side of the knife body and lift it from its locking pin at the tip of the blade, then you rotate the body side CW and it takes the blade with it into the working position, continue CW and place it back on the locking pin.