Coin Shooting at Village Kozheritsy Site, page 5
The Oldest (Deepest) Coins Can Be Detected Only After The Upper Modern Cultural Layers Are Cleaned Of Targets
Then I did not get any signal for a long while. I moved to another spot where I noticed a lot of old dug holes. They were probably left by those two metal detectorists about which the watchman told us last night.
I started moving the coil very slow and detected a coin that usually produces a low-pitch signal due to its small diameter (15 mm or 6/8 of an inch) and thinness, even though it is made of high conductive alloy.
Soviet 1926 1 Kopeck
Then I got a good copper coin signal and dug up a coin.
Russian 1815 2 Kopecks
Next Signal Produced A Russian 1757 1 Denga Coin
After It Was Cleaned