1912, Ocean letter from steamer crown princess CECILIE, a little damaged red printed form-envelope, rough opened, small defect, mailed near the US post office aboard with 5 and 10 C and sea mail duplex U. S. German Sea post 15.9.12 with no. \"13\" as registered letter to Berlin, reverse arrival 17.9.12 and bicoloured perforated DEBEG vignette