Whether or not you still wear a wrist watch in the day and age of the smartphone, getting a nice one will still set you back a pretty penny. Particularly if you want to strap a FP Journe grande sonnerie to your arm.

The watch, considered one of the most complicated in the world, makes a chime to indicate the hour and time. Hodinkee reveals all the steps involved when piecing together the ‘FP Journe Sonnerie Souveraine’ and it's a stunning video. Here is Hodinkee explaining just what makes building the watch’s clockworks so tricky:

Quickly – for anyone that doesn't know what a sonnerie is, it is a watch with an active striking mechanism that chimes the quarters and hours without activation from the user. A grande sonnerie strikes the hours and the quarters each quarter. So, at 3:15, with a grande sonnerie, you would hear three chimes (dongs) for the hours, and then one strike (ding dong) for the first quarter. At 3:30, you would again hear three chimes for the hours, and then two strikes for two quarters.

The incredible video shows the intricacy of the watch in stunning detail. Check it out below: