Sometimes I wonder whether the top melodeon builders even need to publish marketing materials -- I would imagine that the Castagnaris would still be swamped with new orders even if they never bothered to make a catalog. But their line of diatonic accordions is stunning and it would be a shame if no documentation existed for posterity!
On the catalog page of the Castagnari website, the viewer can click through to a digital edition of their latest, gorgeous catalog, which includes photos of the family-run factory and workers, components of accordions-in-the-making, and of course, a presentation of the currently available line of some of the finest button accordions ever made.
I can't resist embedding this beautiful piece of marketing here. Or you can view it here.