The 1976 half dollars were minted in large quantities for the Bicentennial celebration of the United States.
While there are variations and special editions, most circulated 1976 half dollars are not considered "super rare" and do not hold significant numismatic value above their face value.
there are a few exceptions. The 1976-S Silver Proof Kennedy Half Dollar, minted in San Francisco, is made of 40% silver and is sought after by collectors.
These can have a higher value due to their silver content and collector demand. Additionally, any errors or unique varieties among the regular issue 1976 half dollars could potentially increase their value to collectors.
If you have any specific 1976 half dollars that you believe may be rare or valuable, it's recommended to have them evaluated by a professional coin dealer or numismatist.
They can provide you with more accurate information about their rarity and potential worth.