<https://www.catawiki.com/a/269471-italian-silver-auction-post-1945>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/Thing>
<https://www.catawiki.com/l/29189793-napkin-ring-2-800-silver-italy-mid-20th-century>