<http://schema.org/description>
"Gold 20 French francs coin of Napoleon III bare head 1857 A \r\n\r\nDiameter: 2,1 cm (4/5 in.)\r\n\r\nWeight: 6,5 gr. (1/5 oz.)"^^<http://www.w3.org/2001/XMLSchema#string>
<https://en.expertissim.com/gold-20-french-francs-coin-napoleon-iii-bare-head-1857-a-12182807>