Exceptionally fome selection of test stamps, almost 50 pcs! (Image)

10 markka on a protocol Post's CP14 form, Kemi 1957. Scarce use! (Image)

300 markka, 20 markka and 1 markka on insured air mail parcel card to Germany, Helsinki 1962. Very rare! Only less than 5 copies of insured air mail parcel cards to abroad are known (Image)