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BUT ... the other stencil is CT-8. If that
doesn't mean Conning Tower...
Could be a tube that is INSIDE the tower, and as you say it could be to
something heavy that rotates.
Ah! I didn't notice this. Thanks
for the observation!
If it's for BB-63 it would likely be the base for some large (probably
rotating) component like a rangefinder, or gun-director (optical or
radar). In any event, it's only about half the diameter of a conning
tower, and just not heavy enough (these things were 18" thick), and
in an Iowa-class BB they were not round, but oval shaped.
Note the "BB-63"
stencilled just above the weight- this would have been for the USS
Missouri. IIRC, the Missouri
was launched at Brooklyn in early 1944, and commissioned about mid-year,
so the 10/1943 date of this photo
seems about right.