We gave Mario Batali props for keeping his designer lunch bags cheap, but that ain’t the case with the Ernst Benz watch that bears his name. Okay, so Batals is donating some of the money to the Food Bank for New York City, but who blows $4,900 on an orange alligator-leather watch? Anyway, you needn’t buy one to meet him at Barneys tomorrow — he’ll be signing copies of Spain ... A Culinary Road Trip from 6 p.m. to 8 p.m. on the men’s main floor.