Do Swiss automatic watches require batteries?

Automatic watches rely entirely on mechanical gears, springs, and a weighted rotor rather than electrical power. They run on kinetic energy generated by the natural movement of the wearer's arm. When left off the wrist for a prolonged period, the mainspring winds down and the watch stops. Simply putting it on and setting the time restores operation as the internal rotor begins moving again.

What is a bumper automatic movement?

A bumper movement represents an early phase of self-winding technology developed before full rotor mechanisms became standard. Inside the case, the weighted mass swings back and forth through a partial circle rather than rotating completely around. Collectors appreciate these movements for their distinct tactile feedback, as the wearer can feel the internal bumper striking the springs with each gesture.

How do I tell a chronometer from a standard watch?

A chronometer designation appears directly on the dial or movement and indicates that the piece has undergone official testing for precision. These movements feature specialised adjustments to maintain accuracy across various temperatures and physical positions. Standard watches lack this formal certification, though they still utilise the same fundamental automatic winding principles.

Are these watches water resistant?

Vintage automatic wristwatches from the mid-century period were not manufactured to modern water-resistance standards. Original gaskets and seals degrade over decades, making them vulnerable to moisture. Owners should keep these timepieces away from water, rain, and humidity to protect the dial, hands, and internal mechanical steel components from corrosion.