Breguet Antique Number 2667
This watch may not be as complicated as the Aeternitas watch, but this antique pocket watch still has the same sort of elegance. This pocket watch was fashioned in 18 carat gold with 2 complete movements. This watch was first sold in August 1814 for 5,000 francs. Abraham-Louis Breguet designed this watch to test his theory using two clock faces. Presently, the Breguet Museum houses this piece and estimates the cost to be $4.5 million.