Table schema:
CREATE TABLE table_name_69 (date_commissioned INTEGER, gross_tonnage VARCHAR, material VARCHAR, ship VARCHAR)

Question: Tell me the lowest date commissioned for iron rmsrhone and gross tonnage less than 2,738
SQL: SELECT MIN(date_commissioned) FROM table_name_69 WHERE material = "iron" AND ship = "rmsrhone" AND gross_tonnage < 2 OFFSET 738