SOUTHAMPTON, Pa. – Stephenson’s Auction, the Philadelphia region’s top source for estate-fresh antiques and art since 1962, will host an April 21 Decorative Arts Auction of 455 eclectic lots ranging from a stately Pennsylvania tall-case clock to European porcelain and diamond jewelry. All forms of bidding will available, including live at the gallery, by phone, absentee, or live via the Internet through LiveAuctioneers.