Eberhard Pre Extra Fort Tropical Dial

This spectacular Eberhard Pre-Extra-Fort from the 1940s stands out with its unique tropical dial and combines technical sophistication with an exceptionally striking presence.

The natural aging of the dial gives the watch a truly unique appearance. The tropical patina that has developed over decades resembles the surface of aged leather in both texture and coloration – warm, vivid and full of character. This authentic vintage aesthetic makes the present example especially appealing.

The intricately designed dial is further defined by its characteristic spiral tachymeter scale, the so-called “snail scale.” This complex scale configuration was particularly popular on high-grade chronographs of the 1940s and 1950s and was used by racing drivers and pilots for speed measurements. Unlike traditional tachymeter scales positioned around the outer edge of the dial, the snail scale allows measurements over several rotations of the chronograph hand and therefore across longer periods of time. Today, chronographs featuring this elaborate scale configuration are among the most sought-after and historically fascinating examples of their era.

Particularly remarkable is the 40 mm case size – an exceptionally large diameter for a wrist chronograph from the 1940s. The balanced proportions give the watch an impressive presence on the wrist.

Technically, this chronograph also features an extraordinary construction. It is a rare monopusher chronograph powered by the Eberhard caliber 16000, in which all chronograph functions – start, stop and reset – are controlled via the single pusher at 2 o’clock. An additional highlight is the lower slider on the side of the case. This functions as a locking mechanism that allows the chronograph to be secured against unintended operation or resetting – a fascinating technical detail with a functional purpose.

This Eberhard Pre-Extra-Fort combines rare technical features, exceptional proportions and a fascinating tropical dial into a chronograph with unmistakable character and strong collector appeal.

Condition report
Dial: exceptionally well-preserved dial with a tropical patina created through natural aging - intact gilt printing - signed "Eberhard & Co. La Chaux-de-Fonds Swiss Made".

Case: 40 mm stainless steel case in excellent condition - light signs of wear - snap-on caseback - intact case number inside the caseback - original olive-shaped chronograph pushers - original crown.

Movement: manual-winding Eberhard caliber 16000 - timegrapher results: rate deviation -20s/day, beat error: 0.1 ms, amplitude: 328 degrees.

Serial number: 1001xxx

Int.Exe.: 1234022