I've always found that a notched razor feels more comfortable when shaving across the chin area under the bottom lip i.e. from side to middle. It reduces the possibility of catching the lower lip protusion.

Regarding the original question, is the razor a frameback - faux or otherwise? The business parts of these could probably be sharpened more easily than a hollow ground - although why you would want to do it is beyond me. Anyone who wants to trim nasal hair is better off with round end scissors and I'll bet that even barbers know that.