The crown at 4 was used to wind the movement and set the time. The most famous did have dual crowns, one at 2 o’clock and the other at 4 o’clock. counter-clockwise from top left: Hamilton, Wittnauer, Bulova, Benrus, EnicarĮPSA made these cases from the late 1950’s into the early 1970’s. Most SC watches were rated to a depth of 600ft. Another advantage of this configuration is that the O-ring did not have full pressure on it constantly, extending its life. With increasing water pressure, the back was pressed further against the case increasing water resistance. Most of the SC case-backs have a spring on them, so that the back was tight without being completely compressed against the case. The deeper you went, the more pressure was applied to the case-back, pressing it against the O-ring gasket. They designed a patented case sealing method that actually became more water tight the deeper the watch went. Super Compressor is a trademarked name for specific case designs made by the case manufacturer Ervin Piquerez S.A. Most people associate Super Compressor (SC) with any watch that has dual crowns and an internal rotating bezel, but it’s not that simple. The term “Super Compressor” is one that is quite often misused these days.
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