Thanks for the reply John, I'll give it a look. The baseball cap I had many years ago with 3rd class OT insignia, came from our small ship's store at Coos Head. As I can remember, that was the only article of uniform I had purchased other than what was issued in boot camp. Good stuff... lasted four years.
This hat is probably not the same one you are looking for but I found an OT hat at this site that I bought last year.
http://militarybest.com/us-navy-rate-custom-embroidered-caps.html
I had mine embroidered with Kef and Adak on the sides.
With your advice, a fellow shipmate OT (B. Ganoe) from Guam and Coos Head, ordered OT baseball caps from the site that you suggested and they look great. Now will try to find second class crow pins to add to them and we'll be all set. thanks for your help.