basket Your basket >
>
Your wishlist >
reset search

We offer layaway, spread payments on the piece of your dreams. Ask us for details.
Free insured shipping on all orders !!!

jewelry glossary

Antique jewelry glossary

Welcome to our extensive antique jewelry glossary with around 1,500 jewelry related entries.If you feel you are missing an explanation, feel free to let us know and we will add it.

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z     all

Eterna-matic

Eterna S.A. began life in 1856 in Grenchen, a small town in the northwest of Switzerland near other famous watch-making towns such as Biel, La Chaux de-Fonds and Le Locle. The original name of the company was U. Schild, after its co-founder schoolteacher Urs Schild, who set up the company with doctor Josef Girard.

In 1906 the name of the company changed to 'Eterna-Werke', and in 1932 it divided into 'Eterna S.A.' which specialised in precision movements, and 'ETA S.A.' which concentrated on making raw movements.

In 1948 Eterna produced their first rotor automatic, the 'Eterna-Ematic', in the ladies' cal. 1198. The outstanding innovation in this calibre was the mounting of the rotor on 5 ball bearings, each of 0.65mm diameter. This arrangement produced a particularly low friction and rugged mounting for the rotor, which together with a low friction springless double click wheel allowed bi-directional winding.

A similar layout was used in the first men's rotor movement, the cal. 1248 of 1950. The double click wheel was later replaced (1956) by two thin beryllium click wheels side by side, which increased transmission capability and allowed a considerable reduction in movement height.

So successful was the basic design of this movement, that all Eterna automatic movements ever since have incorporated the 5 ball bearings and have been called 'Eterna-Ematic'.

Jewelry Glossary

Missing an explanation?
click here to request one

Jewelry Theme Search
Antique Jewelry Lecture
Adin Wallpapers    Help    Shipping Policy    Dealer Terms    Special Requests    Follow us on :   Twitter   Facebook   Google+   Instagram   Links
Home  |   Site Security  |   Track your Order   |   Return Policy   |   Contact Us  |   Antwerp  |   Terms And Conditions   |   Site Map  |   Blog  |   Testimonials  |   In Memoriam