Duckbill 68

Aluminum and about 4 inches long- looking like a spile for maple syrup-ing, I could not figure out what it could possibly be used for. There is no through hole but there was a hole for attaching something!

 

The patent number told all.  It's a ground anchor, designed to be driven into the earth with a hammer and a rod or tube in the tapered hole. The sharp edges help with penetrating the earth. A cable is pre attached, and when the required depth is reached the pull on the offset cable helps to wedge the anchor in place.  A tube could be used to fill the hole with concrete to further anchor it in place. A specialized thing indeed.