1820/19 50C Square Base 2 AU58 认证号32919532, PCGS号6125

O.101, R2. CAC 1820 was the 4th consecutive year for bust half overdates. And it was a spectacular one, with two varieties each of which boldly display the underrate. This is the square base 2 variety, somewhat scarcer, and while the underdate 9 may not be as prominent as the curl base 2 variety it shows the underdate 1 a tad better. The knob of the 9's tail can be seen at the lower left inside of the 0. Other researchers (Edgar Souder, William Atkinson) feel certain it is an 1820/19/18 based on microscopic image overlays. Both 1820/19's tend to carry a premium over price guides.

Ron Guth

The 1820/19 Square Base 2 Half Dollar is one of the more desirable major varieties of this year.  The overdate is fairly obvious, with a clear 1 beneath the 2 and a slightly less clear 9 below the 0. 

Mint State examples are relatively scarce, with few appearing above MS-62.  According to the November 2011 Population Report, PCGS has certified only one Gem example -- a single PCGS MS65.