The most complicated handmade watch, the Henry Graves Supercomplication, has been sold at auction for 20.6m Swiss francs (Â£13.4m).
A "complication" is a technical term referring to any feature on a watch which is in addition to simply telling the time.
The Supercomplication, made by Patek Philippe in 1932, has 24 of themÂ including Westminster chimes, a perpetual calendar, sunrise and sunset times, and a celestial map of New York as seen from Graves's apartment on Fifth Avenue.
Graves commissioned the Supercomplication watch in order to compete against the automotive pioneer JamesÂ Packard, who owned a watch with 10 complications.
The SupercomplicationÂ has 900 parts and remains the most complicated watch built without the assistance of computers, according to Sotheby's.
It was last wound in 1969. And it's still working.
Read more about this incredible watch inÂ BBCâs full article
ARE YOU INTERESTED IN UNDERSTANDING MORE ABOUT WATCHES?
Assay Office Birmingham is holding anÂ Understanding Watches
course on Wednesday 26th November
This one day course will provide an understanding of the technical aspects and benefits of different types of watches. It alsoÂ teaches basic practical skills which will enable you to diagnose possible faults and carry out maintenance repairs.Â During this course you will also have the chance to handle and study watches closely, as well as disassemble items using standard basic tools.
If you would like to attend this course and improve your knowledge of watches, contact us today on 0121 262 1024 or clickÂ here
Â to download a course booking form.