Guides

"Chronometer" is printed on three different kinds of test: an independent Swiss body that tests a bare movement to one published number, a government metrology institute whose own rulebook sets three different numbers and lets the brand run the test itself under audit, and a layer of in-house standards that are sometimes stricter than both and sometimes just a name. A working guide to what each one actually checks, from the standards themselves.

"Swiss made is not a description of where a watch was built. It is a test with five conditions, four of which are about process and one of which is a percentage — and the Federation of the Swiss Watch Industry publishes a worked example in which the same watch, with the same components at the same costs, comes out at 75% or 87% depending on which of two permitted methods the manufacturer picks. Both are legal. Neither is a secret. Almost nobody buying a watch has seen either."

Every brand publishes case diameter and almost none publish lug-to-lug, which is the measurement that actually decides whether a watch fits. A working guide to the numbers that govern fit, and how to take the one that counts yourself.

Deadbeat seconds explained — the mechanical complication that makes a fine watch tick like a cheap one, why it exists, and every watch that matters, from the Rolex Tru-Beat to the Habring² Erwin.