SOUTH AFRICA 1864 CAPE PACKET DEVONPORT SHIP PMK on LINEN LINED ENV OHMS to GB

Larger size linen-lined heavy envelope OHMS official to Arundel Sussex, by ship H.M.S Griffon, CAPE PACKET DEVONPORT ship postmark 23 OC 1864, LONDON + ARUNDEL postmarks dated 24 Oc 1864 on the back.  Quite battered, obviously contained some weight!