British India S.N. Co's general cargo ship “Chupra” in drydock at Mitsubishi Heavy Industries' Yokohama Shipyard in February 1967.
During the docking cracks were found in the boss of the original propeller. It was replaced by the spare propeller (which most ships carried in those days) which consisted of a boss & 4 separate blades that had to be built up, adjusted & tested at the yard's facilities (a 3-week process).
Note the draft marks in Roman numerals, the usual practice at the time.