The Tasty Sandwich Shop, a diner restaurant in Cambridge, was open 24 hours a day from 1916 to 1997 at 6 John F. Kennedy Street. Behind the counter is chef Don Valcovic, on the right is Al Nidle, publisher of Street Magazine at the time. The restaurant’s customers ranged from long-time residents, students from Harvard University, to bankers and businessmen, all mixing informally.