The ideal image of a clock looks to me like this: Round, diameter no greater than 4 cm and no thicker than about 1 cm; bright, clear and easy to read dial; Automatic movement and leather strap. The specification is as not much - but at the Revue Thommen Nostalgia 1853 you look at what you can do with it: a beautiful clock. I've had more watches than arms before I bought the part and I'm glad I did it.