21 years: 2005 - 2026

Blog: The Mido Watch Company

Date: 11 March 2015

I make additions and corrections to this web site frequently, but because they are buried somewhere on one of the pages the changes are not very noticeable, so I decided to create this blog section to highlight new material. Here below you will find part of one of the pages that I have either changed or added to significantly.

The section reproduced here is from my page about The Mido Watch Company.

The waterproof Decagonal cases with cork stem seal supplied to Mido, and to Patek Philippe, Vacheron Constantin, Movado, The West End Watch Co. and many other companies, were manufactured by Taubert & Fils, who had taken over the famous Geneva watch case making company of François Borgel in 1924. You can read more about the development of the Decagonal case on my page about Taubert & Fils.

If you have any questions or comments, please don't hesitate to contact me via my Contact Me page.

The name "Mido" comes from the Spanish "to measure". It is pronounced "Me-doe" not "My-doe".

There is a page about the history of the Mido watch company at The Mido Watch Co..

Mido Multifort

Mido case back marked Brit Pat 385509: Click image to enlarge

Taubert British Patent 385509: Click image to enlarge

The Mido Multifort watch was waterproof, antimagnetic and impact resistant, one of the very first watches with these features. In 1935 the Mido Multifort Automatic was introduced, bringing together for the first time the four features of self winding, watertight, antimagnetic and impact resistant. The Multifort became the best selling Mido watch until the 1950s.

The cases used for the Mido Multifort were Taubert patented Decagonal cases, with patented cork seals around the winding stem.

The case backs of Mido Multifort watches do not bear the FB-key Borgel trademark used by the Tauberts at the time. They were stamped "BRIT PAT 385509". British patent 385509, an extract from which is shown here. This patent is the British version of the original Swiss patent for Taubert's waterproof Decagonal case and is proof of their origin. The application for a Swiss patent was deposited on 8 May 1931 and the patent granted on 31 August 1932 with the number CH 156807. The date of application was accepted as the priority date for the British patent under the international patent convention. The British patent was published on 8 May 1931 with the number GB 385,509. Watches stamped with this number must have been made after the British patent was published.

The reason for the absence of the Borgel trademark was presumably that, like many other manufacturers, Mido didn't want to reveal that the cases were not their own manufacture. Perhaps because they were an early, possibly the first, adopter of the Decagonal case, they were able to wring this concession from Taubert, who usually insisted on stamping all cases with the FB-key mark, such as those supplied to Movado and West End beginning at around the same time.

To prove that the Multifort functioned under extreme conditions, Mido had it tested by the New York Electrical Testing Laboratories Inc. Tests were conducted in freshwater and saltwater for over a thousand hours. The watches were then subjected to ten cycles of 15 minutes at 50°C followed by 15 minutes at -40°C. The winding crown was subjected to a test representing 34 years of use. Simulated tests of immersion to 13 atmospheres (120 m) and ascending to altitudes of 6,600, 13,300 and 16,600 metres were performed. One of the 6 watches tested ceased operating at 13,300 metres, but apart from that the watches seem to have passed the tests with flying colours.

The success in the tests was due to the Decagonal case and the specially treated natural cork seal for the winding stem. In the history on their web site Mido don't exactly claim to have invented this sealing method themselves, but they do say

Because it formed such a perfect join with the winding shaft, Mido was able to guarantee absolute water tightness even when the crown is pulled out.

In 1959, the cork stem sealing system was named by Mido as “Aquadura”.

Mido case back marked Vacuum: Click image to enlarge

Mido statement that they were able to guarantee absolute water tightness and naming it Aquadura is not the same as saying that they designed or invented the cork stem sealing system. Mido were the company with their name on the dial and so had to take responsibility for their products. However, the way it is said implies that Mido invented the cork stem seal, and the current Mido management seem to believe this because they have refused to discuss it, although they have said that they don't have any records from the time.

It seems that Mido had the tests in New York carried out to substantiate Taubert's claims as to water tightness of the Decagonal before they started using them in 1935, before staking their money and the Mido name on their water tightness, so presumably Bernard Taubert called on Mido at about the same time as on West End, but West End were less cautious and had their watch on the market sooner.

Vacuum

In later Mido watches, the word "Vacuum" is stamped in the watch case back, a trademark the Tauberts adopted in the mid-1950s. See the section Taubert, Manufacture Vacuum for more details.

Later Mido case backs didn't even have this explicit reference to Taubert, simply referring to "Modele Depose" (Registered Design) and "Brevet Depose" (Registered Patent) - which must be a reference to the Taubert patent, because the case backs still had the distinctive 10 flats of the Taubert Decagonal case.