C40, CSS AM48a, 1940-41 - Hong Kong Airmails, $5, narrow type in block of 25 (5x5), with printer's imprint, plate number BJ1.5 and accounting counting number

C40, CSS AM48a, 1940-41 - Hong Kong Airmails, $5, narrow type in block of 25 (5x5), with printer's imprint, plate number BJ1.5 and accounting counting number