Everything You Always Wanted To Know About 70s Watches (But Were Afraid To Ask)





Otra marca Semidesconocida y economica de grenchen que sospecho por el tipo de caja que debe guardar alguna relacion con TRESSA

No hay absolutamente nada de informacion disponible sobre esta marca

Creo que se comercializaban en los 70 en Inglaterra,  el porqué de ese nombre?… quien sabe, desde luego,

el que me vendio el mio,  tampoco lo sabia…

No guarda ninguna relacion con los primeros relojes capaces de reproducir la televison analogica de casio, desde luego

esos ya los veremos mas adelante.

Lo que si me llamo la atencion es que es uno de los primeros relojes antimagneticos que compré.

La precisión del reloj automático se ve fácilmente afectada por los campos magnéticos. Incluso un pequeño contacto con un imán fabricado por el hombre, lo que es muy común hoy en día, puede magnetizar y desproteger el mecanismo automático.

¿Qué significa realmente el término “antimagnético”? La definición estándar actual dice: si el mecanismo de un reloj no se para al estar expuesto a un campo magnético de 4,800 A/m y, por tanto, no varía más de 30 segundos al día, puede ser llamado “antimagnético”.

el clasico diseño de caja Rombo en una unidad que habia en la vieja web de The Retro World

Mi Unidad Un Television 9 Con un dial cuanto menos…”Particular”

Y tambien he visto algun World time por la red de la marca, con corona de plastico (seguramente no era la suya)



Another Unknown brand i believe was Traded on the Uk. market in the seventies.

Looks Grenchen made, and  I suspect by the type of case should bear some relation to TRESSA

There is absolutely no information available about this brand, why that name? .. . who knows,

who sold me mine nor wise …

Bears no relation to the first watch capable of playing analog televison from CASIO, of course… these we will see later.

The Opener in this entry Sports the classic Romboid case design  from tressa  in a unit that was on the old website of  The Retro World

And I’ve also seen some World time by the net from the brand, with a crown made out of plastic (probably not his own)

My Unit its A Television 9 With a somewhat “Particular”..Dial at least.

What Grabbed  my attention is that it was one of the first anti-magnetic watch I bought.

A timer accuracy is easily affected by magnetic fields. Even a little contact with a magnet made by man, which is very common today, can be magnetized and check out the automatic mechanism. What really mean “anti-magnetic? The current standard definition says, if the mechanism of a clock is ticking when exposed to a magnetic field of 4.800 A / m, therefore, does not vary more than 30 seconds per day, may be called “anti-magnetic.”

Anti-magnetic (non-magnetic) watches are those that are able to run with minimal deviation when exposed to a certain magnetic field. The International Organization for Standardization issued a standard for magnetic resistant watches, which many countries have adopted.

The international standard ISO 764 Horology—Magnetic resistant watches defines the resistance of watches to magnetic fields. According to ISO 764 or its equivalent DIN 8309 (Deutsche Industrie Norm – German Industry Norm) a watch must resist exposition to a direct current magnetic field of 4,800 A/m (Ampere per meter). The watch must keep its accuracy to +/- 30 seconds/day as measured before the test in order to be acknowledged as a magnetic resistant watch. Annex A of ISO 764 deals with watches designated as magnetic resistant with an additional indication of intensity of a magnetic field exceeding 4,800 A/m.

There are two ways of building an anti-magnetic watch:

The first way consists in using different alloys, capable of withstanding magnetic fields. These alloys include Invar (iron – nickel – carbon – chromium alloy), Glucydur (beryllium – bronze alloy), Nivarox (iron – nickel – chromium – titanium – beryllium alloy) and Elinvar – an alloy similar to Invar, though less resistant to magnetism and more resistant to thermal influence. These alloys are preferred by different watchmakers due to their differing properties. Since the 1950s, Nivarox and Glucydur were extensively used by watchmakers. In the 1960s, almost all Swiss watches had Glucydur balance and Nivarox hairsprings. The anchors, escape wheels and other watch mechanisms were also made of non-magnetic metals or alloys.

Another way of making a watch non-magnetic is to house the entire movement into a case made of a highly conductive (permeable) material. The movement is covered by an additional soft-iron clasp to prevent the forming of magnetic fields inside the watch itself.

Tissot assembled the first ever non-magnetic Wrist Watch


Una respuesta

  1. Dann Ghaor

    Some really wonderful information, Sword lily I found this.

    30 marzo, 2012 en 8:17


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