1/4 -- 3/8

thats a upset offset,

Looks a bit like a brake bleeder wrench.

Mike

K D 291

deep off set break bleeding wrench
Your right Mike thanks

Agree with brake bleeder tool.  On the Ford special tools board in the dealers shop,  there were a number of extreme offset wrenches for accessing 6 cylinder manifold bolts, and early Ford-o-matics, some neat unusual tools..  also some of the distributor hold down wrenches had some wicked curves.