Lot 30156 – 1950 Hospital Tax stamp error. 1/8g. pinkish carmine

1950 Hospital Tax stamp 1/8g. pinkish carmine with clear double printing, rouletted and imperforate, on commercial airmail cover from Mecca (30.9) to Bombay (30.9), where the recipient could not be found and sent to the Dead Letter Office (9.10 and 11.10), this is the only recorded example of this error on cover