C35, CSS AM43a, 1940-41 - Hong Kong Airmails, 50c, narrow type, Die 2, unwatermarked in block of 25 (5x5) with printer's imprint and plate number BE1.1

C35, CSS AM43a, 1940-41 - Hong Kong Airmails, 50c, narrow type, Die 2, unwatermarked in block of 25 (5x5) with printer's imprint and plate number BE1.1