This was a gift from a recycled building-material yard owner, who was eager to be rid of it.
It was heavily covered with hard, dried mud/soil. I scrubbed it wet, and took a Stainless Texas-toothbrush to the brass plug area.
That plug is marked: WT-7-A. There are no other markings visible on the item.
The small end looks to have had a steel(?) cable in it; the dimple bears very short remnants of multi-strand wire..
Weigh is 1.196 Kg; Length is 4.175"; Major Dia. is ~2.25";
Plug Dia. is ~.500"; Slot is .085" wide and ~.170" deep.
What have I got here? Any ideas, Gentlemen?
Thanks for looking!