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I would have to disagree with you. I have a 100 year old Wheat cent, my first coin many years ago detecting. Dug an inch down under the forest floor. It depends on soil conditions, mineralization, clay, water, etc. I've pulled aged wheats, Buffalo nickels, Liberty Head cents from all these conditions that were fresh dropped in 1923, 1883, 1926, etc. High relief and most in exceptional condition. I still detect to this day and educate others on social media of coins and History.