I just saw Jared Bucknut's post, so I'll post this then head over to his for a closer look. I couldn't take it all in!
I dug these at two cellar holes in between 100s of dig holes. The buckle was 15 feet from the lip and a musket was near that. Every cellar hole gets detected every few days now. There has been an explosion of detecting around here.
Thanks for looking!