Pentax EI-C90 black version (1997)

While researching I came across a picture of a black Pentax EI-C90. All EI-C90's I ever encountered were silver colored. I know that the early prototypes were black but this is a picture of the final version. So I contacted Pentax and asked them if they knew anything about it. The only answer I got was that Pentax never sold a black-colored EI-C90 in Europe. Which leads me to the conclusion that this must either be an overseas model (Japan or USA) or a prototype in it's final stage. If anyone knows more about it please let me know.