Commercial Bank of Scotland Limited, specimen proof of £1, ND (1907), uniface, black on yellow underprint, Head Office building at top centre, left and right, the frieze of allegorical figures from the pediment of the head office building, ink date 18 JUN 1907 at reverse, tear at lower left margin, (PMS CO56sp, Banknote Yearbook SC401 for type, Pick S319p), in PMG holder 50 about uncirculated, rare