Antiques Roadshow was back with a new episode on Sunday, and one guest left expert Gordon Foster baffled with an item he’s “never seen before”. The guest brought along a silverware model of famous Indian landmark, the General Post Office in Kolkata – formerly Calcutta – which was made to contain betel leaves, which were traditionally used as a stimulant. “Well, I have to say I have never seen a piece like this ever before on the Antiques Roadshow,” the arts, crafts and silver specialist admitted as he observed the unique heirloom, adding: “It’s clearly silver.” “I’m not quite sure whether it w…