The "gold" spring is standard for level 7 and also comes with the level 10. Its just a standard mag spring. Its square piano wire and its chomated. Its color can be anything from gold to orange to silverish to multi colored. Its also got a shiny finish compared to the lonq silver which has a dull finish in all the sets I have ever seen.
They used to have a round wire spring many moons ago and it could have lost its chromate due to age, but that's still considered a gold spring. I would consider it older than dirt though since they haven't sold them in nearly 20 years.