In 1923, the icebreaker tug S/S Nalle was built in the Oskarshamn Mechanical Workshop for the Port of Oskarshamn. The ship was equipped with a 250 hp compound steam engine and served in Oskarshamn until 1965.
In 2000, the S/S Nalle Association in Oskarshamn acquired the ship to serve as a museum ship in Oskarshamn and preserve the memory of the time when steam ruled the seas.
Beside the Boat and Machinery Museum in the inner part of the Port of Oskarshamn, the tug S/S Nalle is moored. The former harbor tug, bearing the K marking, including the 250 hp steam engine and all interior fittings, was built in 1923 in the Oskarshamn Mechanical Workshop. The Nalle was originally coal-fired, but in the 1960s, coal was replaced by oil. From her launch until 1965, the NALLE served as a harbor tug in Oskarshamn. During the winter months, icebreaking was her primary task. The active operation of the shipyard in Oskarshamn also required the NALLE's participation. During World War II, the NALLE was loaned to the Navy in Karlskrona and was armed with an anti-aircraft gun on the foredeck.