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A very rare EU25 calibre was fitted to a few early Dial-o-rama's (pictured right and below).

In dozens of Dial-o-rama's I have only ever encountered a few EU25 movements that are likely to be found in cases with low serial number of approx. The EU25 is far more complicated and vulnerable to wear and shock and additionally the working principle is different as the hour disc jumps in the opposite direction!

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The Dial-o-rama is a cult item for all Jump hour collectors and is probably the most recognized of all direct readers.

It was one of the first mechanical digitals that re-appeared in the late 1950's nearly 30 years after the launch of the early wristwatch jump hours like AS340.

The rotating "impulse eccentric", moved by the cannon pinion, gradually lifts the top jump spring ("impulse click spring" #9615) which is quickly released after a full rotation.

This causes the impulse eccentric to jump and a small pin on top of it kicks the copper plated star-shaped wheel ("hour star" #9600) press-fitted on the bottom side of the hour disc.

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The "impulse click" (#9620) fixed to the left side of the "yoke", travels along the unlocking side of one tooth of the "hour star" (#9600) press-fitted to the bottom of the hour disc.

When "yoke" is driven back far enough by "yoke cam" for the "impulse click" to clear the tooth, the "click" under tension drops inward and faces impulse face of the "hour star" tooth.

Benrus didn't produce movements but used Swiss imports.

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