1828 50C O-105 Curl Base 2, No Knob XF40 认证号28754122, PCGS号39758

Ron Guth

Overton 105 is ties with Overton 123 as the rarest die varieties of 1828 Half Dollars.  The 2 in the date on the O-105 has a curled base and a pointed top (also known as "No Knob").  A few high-grade circulated pieces are known, but there is only one Mint State example known at present.