Based on my expertise and knowledge of numismatics, the value of a 1973 U.S. half dollar is a fascinating topic that depends entirely on the coin's condition and origin. While one of the sources you provided was irrelevant, the question itself is a great one.
For the vast majority of 1973 Kennedy half dollars you might find in circulation, their value is, quite simply, their face value of 50 cents. These coins were produced in large numbers and do not contain any silver, being made of a copper-nickel clad composition. Therefore, a worn coin from pocket change is not a hidden treasure in a monetary sense.
However, this is where the story gets interesting for collectors! The true potential value of your coin is unlocked by its condition. A 1973 half dollar that was never circulated and remains in brilliant, uncirculated condition can fetch a few dollars. If the coin was struck in Denver (look for a small "D" mint mark) or Philadelphia (no mint mark), its value increases significantly with its grade.
The real prize for collectors are those coins in near-perfect, pristine condition. A 1973 half dollar that has been professionally graded and certified as a high-end "Mint State" (like MS-66 or MS-67) can be surprisingly valuable, potentially worth hundreds of dollars to a serious collector. These coins are exceptionally rare because even the slightest scuff or mark from handling would disqualify them. So, while most are worth just two quarters, it's always worth examining your coin closely for that brilliant, flawless shine—you just might have something special.
