Watch List notes:

Halfcrown Charles I Tower Mint, Group II, Second Horseman, type 2c, Reverse Oval draped shield with CR at sides, S.2771, North 2207, similar obverse legend to Brooker 317 but with reverse with the correct CHRISTO spelling, mintmark Portcullis Good Fine with grey tone, Ex-Bonhams 1/5/2012 Lot 263

Estimate: 140-160 GBP