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细节
cover 1901 (3 May) grey-blue "Feld-Post-brief" envelope registered to Berlin bearing 10pf. rose-carmine (2, one defective) and vertical pair of 20pf. light blue tied by Field Post Station no.7 (Paotingfu) c.d.s. with the associated imperforate registration label alongside, the arrival c.d.s. on the reverse, light creasing and soiling