Futurematic

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Futurematic E502 Porthole

The Futurematic is a

self-winding[1] wrist watch without a crown. It was manufactured between 1951 and 1959 by the Swiss watch manufacturer Jaeger-LeCoultre. The Futurematic was the world's first watch without a crown for winding the mainspring, having a flat crown on the back that was used solely for setting the time.[2]

Watch face

The Futurematic was produced with two different

watch calibres K497, K497/1, or KP827 were used for the model E501, whereas the E502 contained K817, K817/1, or KP837.[2]

Movement features

All calibres contain a seconds hacking mechanism, which stops the watch when the crown is slid towards the centre, as well as a centrally suspended rotor for winding the mainspring and thus increasing the power reserve.[2] The rotor swings bidirectionally through an angle of about 190°. All Futurematic calibres contain an antimagnetic and an enlarged and heavier (by about 20%) balance wheel, as well as a regulator for the balance spring with micrometre scaling and a unique wire hook mechanism to prevent overwinding of the mainspring.[2] A complete unwinding of the mainspring was mechanically inhibited to allow the watch to start running shortly after putting it on the wrist. The last calibres of both models have Parachoc shock protection and therefore contain a "P" in the name, P827 and KP837, whereas the first calibres possess KIF shock protection.[2] The comparably elaborate construction of the Futurematic was the base of the advertisement slogan at the time - "the most accurate self-winding watch in the world".[1]

Versions

Due to the

red gold), there are more models of the U.S. Futurematics, and an additional case metal variant, 10 carat gold-filled
stainless steel cases.

Bibliography

External links

References

  1. ^ a b Ad in Life magazine, 1951.
  2. ^
    ISBN 9780615223872
    .
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