I think this is a first edition of the R-6 Roller Ball Pen. I say R-6 because the pocket clip is gold and the current model of the R-6 has a gold pocket clip.The body color is an off white. Current R-6s are on the right next to the Red R-4s.
I also have a first edition of the R-3. Starting on the left I have four versions of the R-3.
Here is the first edition of the R-3 up close.
Below is the R-6 with the R-3s. You can see the off white color. Add all these great pens to your collection.