It Almost Looks Like A Gilt Book,

but when opened what a delight!

 photographs Ashmolean Museum, is a gilt-brass cased clock-watch with alarm, sundials and lunar volvelle in the form of a book,

 

it was made by Hans Koch, c.1580, the clock/instrument is just amazing, even more so when you know it is only 10 cm tall!

 

the above illustration and the 2 below I found here, 

dimensions: case 10.06 cm (inc. pendant loop) (length) ; case 6.82 cm (width) ; case 2.74 cm (thickness) ; movement 8.35 cm (length) ; movement 5.24 cm (width) ; pillars 0.84 cm (height), I am just amazed at the craftsmanship of the maker of this piece, it can be found in gallery 55 on the 2nd floor of the Ashmolean Museum.