WERMDÖ

"Wermdo" (1858) was a passenger/cargo steamer which plied from Stockholm to islands in the archipelago. She seems to have lasted till 1873.
Steamer "Hudiksvall II" (originally Daniel of 1853) was so named only from 1886-1888 which suggests steamer on left cannot be her.

Thanks Eddyw. Between the mainland and the islands - I will try the category " ferries" then.