Commercial Bank of Scotland Limited, £1, 31 October 1924, serial number 22/Z 227525, blue and pale yellow and red, John Pitcairn low centre, classical frieze top centre, Thomson and Roberts signatures, reverse blue, bank head office at centre, value at left and right, (PMS CO60, Banknote Yearbook 403), first prefix for type, a fresh extremely fine, scarce in this grade.

Estimate: £300 - £400

SRN: first prefix for type, in PMG holder 55 about uncirculated, scarce in this grade.