It’s a 1971 d, not an s proof. Not a collectible one. Also not silver, because in 1971 they stopped making them out of silver.
I actually have a 1966 silver half dollar.
Here’s how you can tell if a coin is silver or not. Same applies to dimes and quarters. Dimes and quarters from 1964 and earlier are 90% silver. Nickels with a P, D, or S above Monticello are 35% silver. These are dated 1942-1945, called wartime silvers.
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Silver on the left. This applies to quarters, dimes, and half dollars.
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All these have silver in them. In total I have 1 silver peace dollar, 2 silver half dollars (one Kennedy and one Franklin,) 6 silver quarters, 10 silver dimes (3 regular and 7 mercury dimes,) and 6 wartime silver nickels.
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Jared