This is an English bone china tea mug or coffee mug from Dunoon, England which is one of 2 designs from a series called London Skyline.

The 4.125 inch high mug was designed by Richard Partis and features the Tower of London, Big Ben, the statue of Nelson in Trafalgar Square, Westminster Cathedral and more.

The drawings are beautiful and the mug is mint with original sticker, was made in 2007 and now no longer available.