Postcard sent by Karin (Sweden). It shows Långe Jan ('Tall John') lighthouse. So not only the postcard is big: this is the tallest lighthouse of Sweden. It was built in 1785 and stands on southernmost point of the island of Öland, in the Baltic Sea.
When I add the postcard to the album I recalled that I have received Långe Eric (curiously, sent from Finland). Eric is Jan's brother; he stands on the northernmost point of the same island, the second largest one of Sweden.