It was from Herman Aegler's Rebberg firm that
Rolex got their mechanics in a watch. As a teenager Wilsdorf worked at
Cartier watches Cuno Korten with Aegler, a watch exporter in Switzerland. Quite often Wilsdorf would set up 15 watches and check them rolex each for accuracy and it was here at Cuno Korten that Wilsdorf's obession with accuracy began. Also he would submit the most accurate ones to the Neuchatel Observatory for testing
rolex watches without permission. However this was overlooked since all the testing passed and he received much praise from his seniors. Much later Aegler's company came to produce exclusively for Rolex, as it does today. Aegler's descendants still run the company, although owned by Rolex.