S401 glasses have the large eyes that were popular in the late 1970's, early 1980's. Colored in electric blue, this frame has an elegant gold strip overlaid on the frame front; this is a detail that has long been abandoned in eyewear due to its high manufacturing cost and craftsmanship requirements. Also, notice the Revue plaque on the temple corners, carved. The frame front is made of aluminum, and the temples of monel. Aluminum frames are light and stiff and wonderful to wear.