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+====== Zenith 400B ======
+Calibre **400B** is an [[automatic]] [[chronograph]] movement from [[Zenith]]. Released in the 1990's, this was one of the first modifications to the classic [[Zenith 3019PHC|El Primero movement]].
+===== Overview =====
+Because of the unconventional 4 30 date window placement in the classic El Primero movement (now known as Cal. 400), Zenith created a new calibre, **Cal. 400B**, which moved the date to the 6 00 position. This modification required much reengineering of the movement, resulting in a jump in component count from 278 to 328.
+Cal. 400B was also produced in titanium.
+===== See Also =====
+  * [[Zenith 400]]
+  * [[Zenith El Primero]]
+  * [[Zenith El Primero calibres]]
+  * [[Zenith El Primero watches]]
+<WRAP ud ud_mov>
+**Description:**
+  * [[Self-winding]] movement, bi-directional [[central rotor]] winding
+  * [[Escapement]] Stone lever
+  * [[Yoke winding system]]
+  * [[Column wheel]] calibre
+  * 328 components
+**Functions:**
+  * [[Chronograph]] 60 seconds, 30 minutes, 12 hours
+  * [[Small seconds]]
+  * [[Quickset]] date at 6 00
+**Data:**
+  * 13¼ [[ligne]]s
+  * D 30.0 mm, H 6.5 mm
+  * 17/31 [[jewels]]
+  * 36,000 A/h
+  * Power reserve 50 hours
+**Production period:**
+  * -present
+</WRAP>
+{{tag>Movements Automatic_movements Chronograph_movements Automatic_chronograph_movements Column_wheel_chronograph_movements Zenith_calibres Zenith_El_Primero_calibres}}