INDIA: 1850 Stampless Cover-INDIA to GREAT BRITAIN-Ship Letter via Marseilles

INDIA
POSTAL HISTORY

1850 STAMPLESS COVER
INDIA to GREAT BRITAIN
SHIP LETTER via MARSEILLES

Their are several markings of interest--On the obverse: 1) a red boxed (1.5" X .5") INDIA; 2) Directions (in mss) indicating the ship name(can't read it) "via Marseilles"; 3) "paid" in manuscript; 4) and the town name "AYR" . On the Reverse: 1) a large (1 3/8" x 1 1/8") red "SHIP LETTER" box with the date of "7 DEC. 1850" . and 2) a receiving handstamp for "AYR, 17 JAN., 1851" . Unfortunately, I can't determine the charge or the origin.