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+====== Zenith 4001 ======
+The **Zenith 4001** is a calibre by [[Zenith]].
+Further development of the [[self-winding]] movement [[Zenith 410]] (// El Primero //) with bi-directional winding ball bearing [[central rotor]] (Gold Inertia). With [[flyback]] function, day of the week, month and [[date display]] and [[moon phase]].
+Used e.g. with the model [[Zenith Grande Chronomaster GT]] "El Primero".
+<WRAP ud ud_mov>
+**Description:**
+  * [[Self-winding]] movement, bi-directional winding
+  * [[Escapement]] Stone lever
+  * [[Yoke winding system]]
+  * [[Chronometer]] certificate ([[COSC]])
+  * [[Column wheel]] calibre
+  * [[Shock protection]] Kif-Ultraflex
+  * 357 components
+**Functions:**
+  * [[Chronograph]]
+  * [[Small seconds]]
+  * [[Flyback]] function
+  * Day of week indication Switch by a pusher at 7 30
+  * [[Rapid calendar advance]]
+  * Monat Switch by date
+  * [[Moon phase]] Switch by pusher at 8 o'clock
+**Data:**
+  * 13¼ [[ligne]]s
+  * D 30.0 mm, H 7.55 mm
+  * 31 [[jewels]]
+  * 36,000 A/h
+  * Power reserve &gt; 50h
+**Production period:**
+  * Since [[2002]]
+</WRAP>
+{{tag>Movements Automatic_movements Chronograph_movements Flyback_chronograph_movements High-beat_movements Zenith_calibres Zenith_El_Primero_calibres}}