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<p>[QUOTE=&quot;chrisild, post: 101833, member: 39&quot;]Agreed, except that billon can be different from the 90-10 mix. As far as I know (but that may be specific to German terminology), billon is an alloy with less than 50 percent silver. The rest is usually copper but could also contain zinc for example.</p><p><br /></p><p>The federal Swiss 5, 10, and 20 centimes/rappen coins issued shortly after 1850 contain mostly copper but also zinc and nickel. The silver content varies from Ag050 (5 ct/rp) to Ag100 (10 ct/rp) to Ag150 (20 ct/rp). That is, between 5 and 15 percent.</p><p><br /></p><p>Christian[/QUOTE]</p><p><br /></p>

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