The case was designed by Louis Alix, who was granted a Swiss patent CH 146310 for it in 1931. The model was officially certified by the Swiss Laboratory for Horology to withstand pressure in sea depths up to 135 meters.
The case is manufactured in two parts: an interior case encloses the movement and dial, and an exterior case which is hermetically sealed with the exception of one opening point. The first case is inserted into the exterior case and secured via a latch. The present lot was sold by Omega as a movement only, and the case likely made in France.
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