Looks like a clock gear there.
I hunted at an old two story farm house with sandstone foundation stones. It was definitely old but not a single coin. Is your homestead in the country or in the city? City people seemed to lose more stuff.
Also, I hunted an old country doctor's place several times. A huge mansion type place falling down of course. There was a tiny doctors office where he would see patients. There should have been a few coins around but nothing. Nothing around the grand entrance or the steps.
Just keep up and keep us posted.