This glass lens is a duplicate of the Series 2 product from Guide. These quality lenses are made in computer designed stainless steel molds and are actually superior to the originals. If not broken, the originals are often cloudy from the sunlight affect on impurities in glass of that era.
What was a Series 1 lens? These are from very early production and had a rounded front. The factory simply updated the lens to have a pointed front – calling it Series 2. The two designs are totally interchangeable with each other. We chose to reproduce the Series 2 because of it’s greater popularity, and more aggressive styling.