This pair of stamps was issued by Indonesia in 1966 to commemorate Hari Bahari (Maritime Day), celebrating the nation’s maritime heritage and port development. The designs depict shipyard scenes with cranes and a large vessel under construction, symbolizing Indonesia’s growing maritime industry during the 1960s. The 2r red stamp highlights port cargo operations, while the 3r green stamp shows a ship in dry dock being serviced. These stamps reflect the importance of shipping, shipbuilding, and sea trade in Indonesia’s island economy. They are attractive thematic items for collectors of maritime, ships, and industrial development philately.