Sebastian, it's not a perfect translation but it says:

Warranty bulletin

The natural oil razor hone "La Lune" can't be compared to any other.

Its grain fineness, its mineralogical purity allow for a rational and perfect honing WITHOUT ANY DAMAGE FOR THE STEEL.

A rigorous selection of the raw material, originating from the best quarries, a specialized workforce, using millenia-old processes make this hone the UNCONTESTED LEADING BRAND in the WORLD MARKET.