On board the Type 12 frigate Lowestoft (1960) while under way on the River Clyde during final trials. The photographer is looking aft from the port side of 01 deck abreast the C.B.M. store and forecastle locker. The signal flag locker is on the right with its canvas cover folded up and the answering pendant funnel next to it. The foremast, funnel and mainmast are on the left. A vertical format negative.