cover 1934 (8 Feb.) ship's envelope registered from Shanghai to Portoferraio bearing Imperial series 20c. (3) and 30c. (4) tied by 28mm "R.ESPLORATORE QUARTO" c.d.s. on black, blank registration label with "R. E. "QUARTO"" handstamp in purple and showing a group of backstamps; fine and scarce. Photo