SevenFriday Watch PS1/01 PS1/01. As a nod to clean industries, the PS1/01 is a evolution of the S1/01 and it brings the industrial essence into clear focus. With recycling emerging as a result of industrial design, the recyclable number 7 specific animation ring reveals the conscious construction. The smoky grey translucent nylon allows the stainless steel body and fixing screws to be seen for the first time. The interface is stripped back to show the complete engine and the hands have been designed with metallic blue and Super Luminova for optimal visibility