Dial, Movement, Second view of movement, Banking and stop closeup, Under dial view, Stop ratchet closeup, Motion works under dial

Fridlander "Even Time Center Seconds Patent" watch. The dial is laid out with two tracks for the large center sweep hand. The inner red track is calibrated in 1/4 seconds while the black outer track is calibrated in 1/20 seconds. The sweep hand revolves once every 12 seconds. The smaller "accumulator" hand revolves once a minute. The small hand is attached to the 4th wheel and the center sweep is an idler running off the 4th wheel in a 5:1 ratio.

Instead of placing the 4th wheel in the center as in a normal English Center Seconds Chronograph, the 4th wheel is placed in a more conventional position to provide for the 12 second center wheel. Both the 4th wheel and the center sweep are jeweled as are the escape wheel and the pallet arbor. The watch has 15 jewels.

The drive train is similar to a standard Center Seconds Chronograph, but the 3rd wheel is located offset to drive the non-central 4th wheel. The second wheel has a setting square to set the hand and the going barrel is directly wound with a key.

The start/stop mechanism uses a ratchet so that the mechanism is alternately stopped and released on each push of a button.

The watch has patent number 2792 on the back plate and what appears to be a D.R.G. patent 5836 under the dial. The D.R.G. looks more like DRE but I am unfamiliar with that patent designation. Fridlander has an English chronograph patent list in Odmark's patent abridgements, but it is not the same number.

It is not clear whether that patent applies to the odd center sweep or to the ratchet start/stop mechanism. It is possible that the two patents apply to different features.

I have not disassembled a regular Center Seconds Chronograph, but presume the motion works is the same on this watch. The motion train is all under the dial and the minute wheel is a cannon pinion just like the hour wheel. They are both driven from the intermediate wheel in the motion train that is fitted with a pair of drive gears to drive them.

The watch also has an unusual fixture for the banking of the lever screwed to the bottom plate. The banking is not adjustable, but would be easily removed to adjust its form.