Question about original Window Sticker
 

I was looking at the original Window Sticker for my car and find two items that I can't readily identify. While the other information is easily understandable, these two items have me scratching my head. They are the Point of Entry (POE) and the code at the bottom right corner of the page, "N6-154", these two items are shown by red arrows on the attached image. As far as the POE, I didn't find any locations that correlate with the letters NK on the west coast, assuming all shipments went through port on the west coast. About the only location I could think of for the NK code was Newark NJ. Anyone have a clue where this NK could have been? Also does anyone have any idea what the N6-154 code designates? Lastly is it correct that all SA models were manufactured at the Hiroshima plant? Thanks for any insight on these questions.

https://cimg3.ibsrv.net/gimg/www.rx7...013cdb44bf.jpg

Mazda uses a bunch of different ports, they try to get the port as close to the selling dealer as they can, but in 1985 its much looser than now.
Mazda uses:
TA - Tacoma, WA
BE - Benicia, CA
in the 80's they used PH - Port Hueneme, they switched to San Diego, and then are now using long beach
JX - Jacksonville, FL
in 1985 (which is the year i have the most data for) CA - Canada, they have narrowed it down to Vancouver now
NK is Port Jersey City, they are currently using Baltimore instead