1. 1776 Continental Currency Half Dollar:
- Low-grade examples (Good or Fair condition): $500 to $1,500
- Mid-grade examples (Very Good or Fine condition): $2,500 to $5,000
- High-grade examples (Extremely Fine or About Uncirculated condition): $10,000 and up
2. 1776 Flowing Hair Half Dollar:
- Low-grade examples (Good or Fair condition): $1,500 to $3,000
- Mid-grade examples (Very Good or Fine condition): $5,000 to $10,000
- High-grade examples (Extremely Fine or About Uncirculated condition): $25,000 and up
3. 1776 Draped Bust Half Dollar:
- Low-grade examples (Good or Fair condition): $5,000 to $10,000
- Mid-grade examples (Very Good or Fine condition): $15,000 to $20,000
- High-grade examples (Extremely Fine or About Uncirculated condition): $50,000 and up
It's important to note that these values can vary significantly depending on the specific details of the coin, its provenance, and the current market conditions. To get an accurate appraisal of a specific 1776 US Half Dollar, it's recommended to consult with a reputable coin dealer or numismatic expert.