The black center above is due to the reflection of scanner. It is actually a shiny aluminum plate embossed with words, Polychrome Uvimer, Flexomer as you could see inside in color printing.
Polychrome Corporation, a brainchild of Mr. Halpern, is now a major part of Kodak Co. and continues to live on. But the small company spirit died on Jan 1. 1998 when the company became a part of DIC-Kodak joint venture. This blog is dedicated to the memory of those who proudly call themselves "Polychromer". ..... Ken Shimazu shimazukenichi@gmail.com