It's the movement that makes the Longines Ultra-Quartz so special, so this page is dedicated to showing off this extraordinary movement. Known as the Cal. 6512, no other manufacturer used it or the principles implemented in it.

Longines described three Modules in this movement. These are each described fully in the Tech Bulletin link on the left hand side, but briefly they are Electronic Module, Conventional Module and Motor Module. Some of the text below refers to these Modules.

First is a photograph of the complete movement. The battery would occupy the space in the top right.

The next photograph shows another movement with the Motor Module removed; the second photograph shows the Motor Module outside the movement. This module does exactly what it says: from the vibrating coil, it generates an impulse to drive the hands. The impulse is created through an indexing system that is identical in nature to the one used on Bulova Acutrons and ESA 9162/9164s.

The picture of the movement below also shows some sort of repair to the cannon pinion top pivot which is part of the plate with the writing on. This seems to be a common problem with this movement; I have several busted 6512 movements and others show repairs/alterations to this area. Compare this with the same area on the good movement above.

The two final photographs show the silver coloured torsion bar, counter weight and coil from the Motor Module. You can also see the indexing pawl + jewel that engages with the Index Wheel, also part of the Motor Module. In this example, the torsion bar is slightly bent which has resulted in the coil touching the sides of the permanent magnets (see photo of the complete Motor Module above)...and the coil is now open circuit and useless.

Although the Electronics Module is complicated with all that soldering and all those components, it is this delicate coil that fails on these watches...and, I suspect, usually due to careless handling and / or adjustment.