Watch List notes:

(x) Bank of England, C.P. Mahon, [Error, same SN pair] £1, ND (1928), serial number B42 130749/B42 130749, (EPM B212), in PMG holder, 50 About Uncirculated, 45 Choice Extremely Fine, scarce, duplicate serial number error (2 notes).

Estimate: £1000 - £1500