Hey mafiamouse,
I looked at the pic of your knife on eBay. While it has a straight razor style blade, it is a knife and is not a straight razor that is intended to be used as a shaver. I've seen trapper style slipjoint folders with this style of blade, too.
With a real str8 razor, you lay the blade flat on the stone when sharpening. The width of the spine gives just the right angle for sharpening the edge. With your eBay find, this may or may not work to give the best angle for the edge bevel. I suppose it would depend on how you want to use the knife. The narrower angle will give a really sharp edge, but will be a lot more delicate.
With that being said, I would sharpen it in the same way that you would sharpen any hollow ground knife.
Parry