If that is from where I think it is (Ebay?), the ones I received were indeed RICOHJPN R01. I had also picked up some of the 4X Imation from him and they were also R01. Have bought a few things from him and was always satisfied.
Now, I bought these from him maybe 6-8 weeks ago so his stock may have changed, but for the most part all of the 4X +R Fuji I have picked up over the years has been RICOHJPN R01 which I really like.
Both brands (Fuji & Imation) burn very nice in my 1640.