The El Primero 3600 is a manufacture movement by Zenith.

Automatic column-wheel chronograph movement, able to measure and display the 1/10th of a second. Redesigned to pay tribute to the 50th Anniversary of the legendary El Primero movement from 1969. Increased power reserve of 60 hours, new stop-second mechanism.

Used e.g. with the model Zenith Chronomaster Sport (2021).