What pains me is the countless items of similar appearance I myself have overlooked at garage sales and thrift shops.
The items, in this instance, consist of 5 16th & 17th Century carved cups out of rhinoceros horn, worth together between 1 and 1 and a half million dollars.
Link: 'Antiques Roadshow': Most Valuable Find Ever (Video), Item at Antiques Roadshow Breaks Appraisal Record (text), Google Image Search for Carved Rhinoceros Horn