2608 - The hooked top obviously pivots. I've tried various searches of vintage piton, wire piton, pivot head piton and similar.... I've used "screw" and "nail", rather than piton, as keywords, also. The pivoting hooks might can be used as a self latching latch, for a gate or some such. The screw part, to me is for screwing into wood and it's large enough for a latch.
Another idea I had, remembering the paint can carrier from the What Is It? Set 448. Something like a linemans piton for holding tools or wire (temporarily?). I've tried various "utilityman's" and "utility" keywords, also.
All such searches have failed to find something.
Sonny