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One other plus for the barber hone is, it's easier to travel with than a larger stone.

Thanks for the clarification. Yep, a barber hone or finish hone should do it. Here's a link to an FAQ on hones for refreshing a blade. There's a list of finishing stones on the page as well.
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I guess I'm wondering what you mean by "moderately dull?" If you mean your razor is starting to pull when you shave, then a few passes on a barber hone, or other high grit hone would work. If it...