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Sorry for the delay. Not very good at Japanese, but the important parts are:

本床向最高級品で切れ味抜群です (For barbershop use...? unsure of translation of 本床向), highest quality product with outstanding...

The closest thing I found to traditional advice was the 15:3 on the Henkotsu insert.

130611
http://i.imgur.com/jnwOoOt.jpg for bigger version