David,
how much did she spend on it? I mean - a famous shop would not be selling finest hones cheap, we can be certain about this. The Japanese have hones for razors that run from say $60 to thousands of dollars. Did she get any additional info?
There are a couple of people here that may be able to help you. There is also a member in Japan - Norman, his wife is Japanese. If it comes to this - I can ask him to help you
Cheers
Ivo