CHICAGO – On December 1, Hindman Auctions will offer sea silk, a highly coveted material, in a one-of-a-kind selection. The sale will offer a hat, shawl and pair of gloves made from knitted sea silk, a substance that is also known as byssus. The items are family heirlooms, which the owners date to around 1920, with a story that traces the items to southern Italy, one of the most important historic sources of sea silk. Absentee and Internet live bidding will be available through LiveAuctioneers.