IF you're in any way serious about selling knives, I feel the mark needs to be something that folks can use to easily find you.
I'm sure you've read other things I've written about it, but it bears repeating. First, kudos for making your own stamp! I'm not trying to be a 'Debbie Downer', and I don't know how important this is to you, but if you're going to mark blades, I really believe it's in your best interests to mark them in a manner that will allow people to find you.