A treasure trove of unique gold coins unearthed by a California couple out walking their dog has gone on sale, with one coin selling for $15,000 (£8,968) on Tuesday. The coins date from 1847 to 1894 and have been valued at $11 million. Several coins were auctioned at the Old San Francisco Mint at 8:30 p.m. Tuesday 27,05.2014, and one of them — an 1874 $20 double eagle that is usually worth $4,250 (£2,540)— sold for $15,000 (£8,968).
