青函 - Seikan
貨車連絡 - Train Ferry Connection
記念 - Commemorative
14.5.24
Until the opening of the Seikan Tunnel in 1988 https://en.wikipedia.org/wiki/Seikan_Tunnel, ferries were the primary means of travel between Honshu and Hokkaido, and Aomori served as the hub for travelers to transfer between train and ferry.
Nicely enamelled set.
Original case.