LeCoultre Futurematic - world's first watch without a crown
Jaeger-LeCoultre Futurematic made this watch on the early 50's, it's an historical model, the first one without crown for widing the mainspring, it does has one crown hidden on the back case but just for setting the time. This is built to be a daily watch, it's an automatic, anouced as the most accurate automatic watch (back in the 50's) it even has an power reserve indicator to to inform the owner that the movement was about to stop should the watch not be worn again.
Some info from wikipedia:
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.
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. 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. A complete unwinding of the mainspring was mechanically inhibited to allow the watch to start running shortly after putting it on the wrist. 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".
Due to the Smoot–Hawley Tariff Act the Futurematics for the U.S. market have a LeCoultre logo instead of Jaeger-LeCoultre printed on the dial and engraved on the calibre and the inside of the case back. As an exception to this rule, all case backs of U.S. and European Futurematic models are internally engraved with LeCoultre, whereas the other markings differ. The cases of the U.S. models and the dials which were produced in the U.S., encase a Swiss-made watch calibre engraved LeCoultre. The U.S. models were distributed by the company Vacheron-Constantin-LeCoultre, a subsidiary of Longines-Wittnauer. Therefore, there are differences in the case forms and the dials between the U.S. and the European models. While the European models had only two watch case forms and were produced in three metal variants (stainless steel, yellow gold, and red gold), there are more models of the U.S. Futurematics, and an additional case metal variant, 10 carat gold-filled stainless steel cases.