We bought our house about 5yrs ago. It was built in 1860 as a hotel. A few times during the summer months my buddy brings his metal detector over and we put holes all over my yard.
He has to "dial out the trash" on the detector so we're not digging up roofing nails and aluminum foil, but we've dug up a hand full of pennies,dimes, and quarters over the years, most of them dating around 1895-1920's.
About 2 weeks ago we dug up the oldest one so far. An 1882 penny about 8 inches deep and 5 feet from the front porch. Still have yet to dig up a nickel.