London : The Tower of London
Publisher: Pictorial Post Card Co. (1904-09)
On the back of this card, which was sent to Tasmania, “Post Card” has been crossed out and replaced with a handwritten “Book Post”, so the sender could pay the cheaper rate of a halfpenny for “Printed Matter” rather than the overseas postcard rate of one penny.
Publisher: Siegmund Hildesheimer & Co, London & Manchester (1830-1920)
More cards of the Tower of London here.