The Japanese section of the Stibbert Museum, in Firenze, is one of the most important in the world, excluding Japan for obvious reasons. Here many different artifacts are conserved, even though only a little archaeometric investigation has been performed, so far, on this collection. In order to help the Stibbert Museum filling this gap, CNR-ISC has recently started a research cooperation activity with the aim of providing scientific support for this kind of analysis. They include surface analysis techniques, and micro hardness measurements. In this cooperation activity, neutron diffraction measurements constitute the backbone of this set of experimental techniques giving quantitative information on the phase composition and manufacturing techniques of metal artworks. We plan to investigate, a series of 10-12 objects of different compositions and ages, by neutron diffraction.