Watch List notes:

MS62 | The Undated Mule | Elizabeth II (1952-), Undated Twenty Pence, [2008], edge plain, 5.01g, 12h (S.G4A [4631A]), the first currency coin struck without a date for circulation in Britain since the reign of Charles II, a famous modern rarity, yellow stain to crown, otherwise much as struck, in NGC holder, graded MS62 (Cert. #6295117-014).

Estimate: £50 - £80