In 1945 the Navy had a major revision of colors and went with neutral grays as opposed to the earlier purple-blues. 5-N Navy Blue was re-designated 5-NB, and the designation 5-N was used for "Navy Gray" a dark-ish gray that was the same tone as Navy Blue, but neutral.
One would hope that a reader would know better than to think that a paint that came out in 1945 would be used in 1942 or '43, but I've seen stranger things happen.... I just want to keep the details and names straight for everyone to minimize confusion in a topic that's already confusing!
 
 







































