1872/77, 20 öre red, vertical pair (lower stamp slightly rounded corner), tied by clear c.d.s. "GÖTEBORG 23 9 1878" to small cover to Mauritius, with transit marks of Naples and Aden and arrival mark of November 17. A very rare destination; just two further covers at the 40 öre rate have been recorded. Certificate Obermüller-Wilen (2013)
