In general, the value of a 1912 US Half Dollar in circulated condition is as follows:
- Philadelphia mint mark: $10 - $15
- Denver mint mark: $15 - $20
- San Francisco mint mark: $25 - $30
However, if the 1912 US Half Dollar is in uncirculated condition, the value can be significantly higher. For example, a 1912 US Half Dollar in MS-65 condition (meaning it is extremely well-preserved) can be worth over $100.
For more accurate valuation, it is always recommended to consult with a reputable coin dealer or appraiser who can examine the coin in person and provide a professional opinion on its value.