Watch List notes:

USA, 1936 50C, Maine, York County, Tercentenary 1636-1936, by Walter H. Rich (KM 189; NGC ID BYKV; PCGS ID 9449), brilliant uncirculated, 25,015 struck in early PCGS holder, graded MS65 (Cert. #9449.65/02824009).
The finest certified example of this Commemorative series, PCGS graded MS69 (CAC Certified) sold for an impressive $102,000 in Chicago in August 2019
Estimate: £80 - £100