在2003年蘇黎世的拍目中的說明,我摘錄如后:
1/2c. on 3ca. orange-yellow, variety surcharge inverted, cancelled by "Customs/Shanghai"
c.d.s. (Mar. 1897), centred to top as usual, very fine and a rare error of which approximately
only a dozen examples, all used including two pairs, have been recorded to date.