I have 4 old fly rods made of the brown colored fiberglass. One is Saint Croix one is a Montague and the others are of unknown maker. I know fiberglass wasn’t used much until after WWII. And my question is what was the time frame that the brown fiberglass was used. I know the rods have little value and I acquired them as gifts or from second hand stores. Like many, it’s not the monetary value it is the number of rods you have in your quiver, and I like to have them useable if I can. So far so good.