Ok, great information. I was using this to date a few hats I recently picked up.
So the hat marked NXSX95449 is approx Feb 1945
The hat marked N383-72337 could be wartime to post war. Looks like no definite info here.
But, here is a different one, I got a hat marked SXSX70217, I did not see anything about SXSX. Any help on this one?
Thanks - Jeff