I just bought some postcards and covers from a seller in Finland. The corner of the postcard shown has me stumped though. It was mailed thru Lubeck Germany. The postage due T handstamp and the value 10 I get since I guess it was mailed after the 5 santimi increase in postage to foreign countries in 1928. But what is the violet boxed handstamp? A postage due marking in Germany?
