Pic 1: 1821 50C Overton 106, PCGS AU55
(Image courtesy of PCGS CoinFacts)
Pic 2: 1821 O-106, PCGS EF40 (Image courtesy of BHNC #228)
Obv. 5 Star Positions: [S7-3(5)_S8(2)_S13(5)_S1(5)]
Date is 7.75 mm. 21 is lower than 18. Star 13 is only 0.25 mm. from curl.
Rev. F Scroll Diagnostics: [IT-4, BEM(0, .5)]
50 C. is 1.75 mm. Some specimens exhibit a dot in field between R in PLURIBUS and eagle's head, as well as a small patch of lumps under the eagle's head. Tiny spike protrudes from eagle tail feathers half way down. Tine through base of shield just right of stripe 3. Center dot between crossbars 4 and 5. Crossbar 3 extends in right wing. A-A is 0.25(+) mm.
Pics 3-4: 1821 O-106.1, PCGS EF40 (Images courtesy of BHNC #228)
Pics 5-6: 1821 O-106.2, PCGS MS63 (Images courtesy of Heritage Auctions)
Bust Half Nut Club Die State Progressions:
o 106.1 NO DIE CRACKS [R1].
o 106.2 Die chip rev in upper angle of N [R1].