Need 400 really clean nickels for your antique slot machine ? They are a mixed lot of years that are used. They where tumbled clean 24/7 for 168 hours then washed in a parts washer with clean distilled water then dried quickly. This long process results in a very clean nickel that is perfect for antique slot machines to keep them clean on the inside. All nickels are used and may have blemishes. Years will range from current to old, whatever came out of the bank roll is what was cleaned. No returns.