My old Meterotech 220. Together we hauled trunk loads of Civil War relics out of the Harpers Ferry area.
Metrotech still makes a metal "locator" they brand the "220." I do not know good today's machine is relic hunting. Today's 220 is labeled for industrial use.
The old 220, my Metrotech, was the Cadillac of relic metal detectors. Of course it would find coins and other small objects, but given there was no target pin pointer and the coils were large sometime recovery holes got a tad on the big side. I remember hunting with a fellow near the Antietam Battlefield we were coming up this little hill where over shots would have came down and till we were done we had that ground resembling a freshly dug garden ready to plant. The landowner was surprised how many minnie balls were in his field. You must keep in mind this was in the relative early days of metal detecting, the hobby was no where near as popular as it is today. I'm sure those fields are picked over many, many times since.