TSS (RMS) Manx Maid (I) No. 131765 - the first ship in the Company's history to be so named - was a packet steamer which was bought by the Isle of Man Steam Packet Company from the London and Southwestern Railway Company, and commenced service with the Steam Packet in 1923.

Royal Mail Ship, usually seen in its abbreviated form RMS, is the ship prefix used for seagoing vessels that carry mail under contract to the British Royal Mail. The designation dates back to 1840. Any vessel designated as "RMS" has the right both to fly the pennant of the Royal Mail when sailing and to include the Royal Mail "crown" insignia with any identifying device and/or design for the ship.