Check your change and down the back of the sofa after a rare 50p coin sold for 250 times its value on eBay this week ...

online sites and coin shows — you may actually get the best prices at auction houses. Trending Now: For buyers, auctions have ...

Last year was a lucrative one for sellers of rare coins, as one auction house sold five specimens for more than $1 million each -- including one that fetched a record price in its category.