Watch List notes:

Sixpence 1819 First T over B in BRITT, the 9 of the date curiously struck, not, in our opinion, over an 8 as suggested by the new ESC, CGS type SP.G3.1819.03, UNC, slabbed and graded CGS 80, the only example thus far recorded by the CGS Population Report, this CGS UIN 1000, so another 36000 coins have been graded by CGS without another of this type having been recorded

Estimate: 220-260 GBP