1940 ESSR “Äripaberid/Business papers” rate double censored registered cover Tallinn-Berlin-Copenhagen, Denmark

Attractive commercial cover with scarce “Äripaberis/Business papers” rate (note black inscription “Via Deutschland / Äripaberid – Eilige Verladedokumente”).  Letter opened and re-sealed by German censor in Berlin plus red round censor mark with violet arrival from Copenhagen, Denmark. Correct franking: business papers up to 250gr 30s + registering 20s = 50s.