The discovery of the ninth known 1817/4 overdate Bust half dollar was announced by J.P. Martin, senior numismatist at Independent Coin Grading in Englewood, Colo.
The coin was authenticated by the firm and graded VG-8 with an obverse scratch. It was found in an older collection in Colorado.
Coin Market lists a retail value in the VG-8 grade at $80,000.
ICG can be contacted at (877) 221-4424.