I received some input from Tom Cutter. He says they were essentially the same as the R100 Classic sold in the US. They were the same as the early '85/86 R80s with the 1000cc engine and no fairing. He's not sure, but it's possible there was an over production situation and they were marketed in Japan.
Hi there...apologies, I must have missed your original post/reply. Thanks for the information (from Tom Cutter as well). I'm going to create a new post about these Japanese R100s. They were actually marketed in Japan as the R100 Trad, and they were in fact originally destined for the Egyptian Police, but they cancelled their order, BMW did some re-configuration, and they ended up shipping around 200 of these bikes to Japan during 1990/91. Watch out for that post and I'll included references and some photos.