Inside the 3 Days Automatic is Panerai’s P.4000 caliber, which was the brand’s first foray into micro-rotors when it was introduced last year. Panerai calls it a “decentralized rotor” and it helps in keeping the movement’s height in check. As the name suggests, the movement offers three days of power reserve, but since it’s an automatic, keeping the watch ticking along shouldn’t be much of a hassle. 

The Radiomir 1940 3 Days Automatic Titanio is priced at $10,700