A 1 oz silver coin generally refers to a coin with a weight of one troy ounce of silver. The exact dimensions (diameter and thickness) can vary slightly depending on the specific coin and the mint that produced it.
However, a commonly recognized example is the American Silver Eagle . It has a diameter of approximately 40.6 millimeters (or 1.598 inches) and a thickness of approximately 2.98 millimeters (or 0.1173 inches).
It’s important to remember that while the weight (one troy ounce) is consistent, the physical dimensions might differ slightly between various types of 1 oz silver coins.