Royal Mail Heritage: Mail By Sea
   Packet Antelope, 1780
   SS Great Western, 1838
   SS Britannia, 1887
   RMS Olympic, 1911
   RMS Queen Mary, 1936
   RMS St Helena, 1990
      without extra imprint
         17-digit No.: xxxxxx xxxx-xxxx-xxx

different imprints: 1st Class up to 100g / 1st Large up to 100g / Euro 20g World 10g / Worldwide up to 10g / Worldwide up to 20g / Worldwide up to 40g / 1L / 1LG / A Letter / 1L Signed For / 1LG Signed For / SD1

         16-digit No.: xxxxxx xx-xxxxxx-xx

different imprints: 1st Class up to 100g / 1st Large up to 100g / Euro 20g World 10g / Worldwide up to 10g / Worldwide up to 20g / Worldwide up to 40g

         16-digit No.: xxxxxx xx-xxxxxx-xx

different imprints: 1L / 1LG / A Letter / 1L Signed For / 1LG Signed For / SD1

      extra imprint: The Postal Museum

      extra imprint: Voices from the Deep / The Postal Museum