Bell 17x19 mm
Colour: black
Items known:
28.11.1921 Stockholm to helsingfors (FI), black
28.11.1921 Postcard to Finland. Correct rate 25 öre. Shortpaid 10 öre. Amount due 2x10/0.8=25 ctm. 90 p due indicated in Finland, corresponding to the UPU minimum amount 30 centimes.