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jmaryt
am thinking that the metal composition of the coins has something to do with that.
Yes metal composition, which define one of most influential factor in coin detecting, namely coin
surface conductivity. CZ-3d perform better to ancient (Roman etc.) coins, which are rare in NA,
but very frequent target on most EU terrains from UK to Greece.
Of course this does not mean that CZ-3d is not suitable to modern coin hunting, but if you
can chose, then take par example CZ5 for modern era coin hunting.