ETA 2892A2 PDF

This third generation of the ETA family appeared in and remains in production today. The modification was focused on winding efficiency, with a reduced chamfer increasing the mass of the winding rotor and the switch from a stud to a jewel in the upper winding bridge for the intermediate wheel. By the s, many other movement makers offered an ultra-thin automatic movement that could compete with the ETA. The original ETA measured The Sellita movement, distinguished by its 25 jewel count, is very popular and has replaced the ETA movement in most applications outside Swatch Group.

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It was introduced in as an update to the outgoing ETA , and remained in production until The current ETA A2 is the successor movement. But when the diameter of the plate was reduced from The winding mass, combined with inefficiencies in the automatic winding works, caused the ETA and related second-generation movements to disappoint users by not being fully wound throughout the day. This was remedied in the successor ETA A2. Since it was easy to omit this display, and the advanced date works did not affect the 3.

The original ETA measured Notable variants on this movement include the IWC , , , , and Clones of this movement include the Sellita SW They are generally regarded as superior to the similar ETA family. The family remains one of the leading watch movements to this day. The most well-known movement in this series today is Cal. Because of its slim dimensions, Cal. Distinguishing features of the ETA family include a smaller balance wheel than historic movements, including the ETA family , and a large rotor hub located with seven visible bearings.

The balance is located at when viewed from the back with the crown at , and is located by a clockwise cock with an eccentric screw for regulation. ETA Family Most current ETA family movements have been updated since the s with improved winding efficiency and an extra jewel in the upper winding bridge. Specifically, Cal.

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