Having been moved to write an article on silver (foundation stone) cermonial trowels some years ago, I now find myself in the grip of a fascination with ceremonial (opening) keys. I have just listed three Birmingham Guild keys from 1937-9 that are beautifully made and represent the pre war optimism and ambition of St Pancras, now Camden, council. The commissioning architect of the keys was Albert John Thomas, senior architectural assistant to Edwin Lutyens . Full details at this link.