Octogonal 18x18 mm
Colour: black
Items known:
5.5.1906 Stockholm to New York (NY), black
5.5.1906. Postcard to USA with divided address side, taxed as letter. Letter rate 20 öre. Shortpaid 10 öre. Due handstamp indicates amount missing: 10 öre/0.80=12.5 ctm. This amount has been doubled and converted to 5 US cents.