According to tradition of the historic church St. Mary-le-Bow, the city dweller must be born within earshot of what?
St Mary-le-Bow: St Mary-le-Bow is an historic church rebuilt after the Great Fire of 1666 by Sir Christopher Wren in the City of London on the main east–west thoroughfare, Cheapside. Cockney:  Originally a pejorative term applied to all city-dwellers, it was eventually restricted to Londoners and particularly to "Bow-bell Cockneys": those born within earshot of Bow Bells, the bells of St Mary-le-Bow in the Cheapside district of the City of London.
i don't know