Comparing a Tribal's open mount directly with the much more complex enclosed 4.5- or 5.25-inch installations would be misleading. Mount components could be manufactured in advance and assembled at the factory in a few days, while an enclosed turret required more construction work. A ten-month figure referred to an initial batch rather than to a single 5.25-inch turret. The fitting dates of Dido and King George V suggest that the first batch was reaching ships around mid-1939, illustrating how production records must be read in context.
Notable Point · 2:31:08-2:37:32
Mount assembly was not the same as turret production
A production discussion separates the rapid assembly of an open destroyer mount from the manufacture and delivery of an enclosed capital-ship turret batch.