Westfront is correct, it's to a horse harness! Bet you had a "cow" when you found it, it probably blew your ears off.
many thanks for ID....it wasn't quite 2 feet deep but the signal was kind o goofy....that was it for the day with the exception of 1x 50 Euro Cents + 1x 10 Eurocents......the 50 Cents popped up before I could even take one step after firing my Nox 800 up.....