1976-S uncirculated silver half dollar. Its in a 3 piece silver uncirculated set so…

Answering your three submissions at once. What you submitted separately are the three coins in the Bicentennial uncirculated set - Eisenhower Dollar, Kennedy Half Dollar and Washington Quarter - with the dual date 1776-1976. They were issued in 40% silver in proof sets and uncirculated sets. You have an uncirculated set. When the sets were issued, they came in a red envelope and had a cardboard holder you could put them in. The total silver melt value at today's silver price is about $36. A pristine set in the original packaging may fetch a bit more.