Neptune was a older reel manufacture. It's possible they contracted out some rods. Maybe even for Nep Tune lubricants. They have supplied commercial boats lubricants for years. Good Luck on your quest to find out info on this rod.
Since were on the subject of vintage fishing equipment. Do any of you guys know how the 2/0, 3/0,4/0 size reels ever came about?
When people talk about salt water reel sizes they talk in terms of 1/0, 2/0, 3/0, 4/0, 6/0, 9/0, 10/0, 12/0, 13/0, 14/0, 15/0, 16/0, 18/0 & 20/0. The /0 on the end of these terms seems to have been made up for a reason which was shortly thereafter forgotten and has remained shrouded in mystery for many years. It simply meant "OCEAN" or reels built primarily for saltwater use.
Very few Companies made what is considered the Granddaddy of all reels the 20/0. Due to lack of demand and cost concerns only a hand full of these reels were ever made and even fewer exist today. The measurements of a 20/0 would be between 9 to 10 inches in diameter and between 5-1/2 to 7 inches across the inside of the spool.
I don't know if any of you guys collect vintage reels. The best of the original reel machinist was Arthur Kavalovsky. He made most of the reels in Zane Grey's collection. They are very expensive if you can find one.
Here's some pics of the good old days of Zane Grey and Kovalovsky. I'll even throw one in of Hemingway shooting his sub-machine gun off a pier. He reminds me of Gunsmoke. Hardcore about everything in life. Never a dull moment. Hemingway only wrote books to support his drinking, women, and fishing habit.