Patented in 1956 by Ervin Piquerez SA (EPSA), the SuperCompressor case possessed a unique sealing system that set it apart from other dive watch cases of the day. When exposed to higher water pressure, the spring-loaded case back of the SuperCompressor case sealed even tighter. Another innovation with the SuperCompressor was its three-pronged approach to securing the bezel. Whereas the bezels of most dive watches of the period rotated in both directions--running the risk of the diver miscalculating the amount of air left in his tank--the bezel of the SuperCompressor included an internal timing ring, only rotated in one direction, and locked.  The diver must rotate the bezel with an additional crown, giving the SuperCompressor case its distinctive twin crown appearance. While not the best innovation in practice (due to the difficulty of manipulating a crown with diving gloves), the SuperCompressor case gained popularity. Dozens of other brands released dive watches with SuperCompressor cases, the most notable being Jaeger-LeCoultre, Enicar, Universal Genève, and IWC, Benrus, and Longines. 

SPECS

CASE & BRACELET

The excellent super-compressor case is believed to remain unpolished retaining strong factory dimensions with honest signs of light use. The case retains its original twin crowns, showing the classic super compressor cross-hatched texture. The original crystal exhibits some crazing which is common for crystals from this era. The case back retains all of its original factory markings clearly and in great condition. The watch will come supplied on a 2pc tropic rubber strap.

DIAL & HANDS

The sunburst grey dial is in simply stunning condition, showing no major signs of age or blemishes. The tritium markers have achieved a charming patina and exhibit no degradation when inspected under U.V. light. The original tritium hands match the dial perfectly and display no degradation under U.V. light inspection.

ACCESSORIES 

None. The watch is functioning and keeping time, previous service history is unknown.