Measure 11 is a bit of a complex topic. It was offered as a measure is September, but by that time the Navy wasn't as happy with Sea Blue and
by early November they started changing things. Initially, By December/January even the Pacific Fleet was ordering "Measure 11, with 5-N navy Blue
in lieu of* 5-S Sea Blue." This is essentially the exact same as Measure 21, for what it's worth, so it can be argued that Measure 21 started appearing in early 1942 or possibly late 1941 or it can be said that perhaps we should have a special designation of "modified Measure 11" to better track which was painted what.
This looks too dark for Sea Blue and I am 99% sure she is painted in the 5-N Navy Blue version of Measure 11.
* This document refers to Measure 12, but is included as an example of the substitution and wording.
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Tracy White -
Researcher@Large"Let the evidence guide the research. Do not have a preconceived agenda which will only distort the result."
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Barbara Tuchman