What is a “bumper” movement?
A “bumper” is an early automatic movement. Unlike a modern automatic, where the rotor spins a full 360 degrees, the rotor of a bumper moves… Read More »What is a “bumper” movement?
What is a “bumper” movement ?
A “bumper” is an early automatic movement. Unlike a modern automatic, where the rotor spins a full 360 degrees, the rotor of a bumper moves… Read More »What is a “bumper” movement?