Da Capo candy

If you are my age and went to school in Finland in the 1940's you can recall this tiny (about 3½ inches) dark chocolate candy bar with a very strong taste. We didn't have much money in those days, but we could just about afford one Da Capo chocolate bar to replace the lunch with. I always thought that this candy came about in the 1940's (after the wars) but I am reading now that Fazer introduced it already in 1916 and has reintroduced it again.