Thomas Dimitroff holds a piece of Steuben Glass from his collection in Corning, N.Y. Steuben, an American icon of handcrafted lead crystal, looks now as if it’s vanishing for good. Its lone factory in Corning is closing Nov. 29. With profitability elusive at the best of times, the prospects of reviving the 108-year-old brand seem just as slim, according to Corning Glass Inc., which sold the brand in 2008 and is buying it back. Corning Glass may rehire some of the 60 Steuben workers who are losing their jobs.