Jaeger-LeCoultre Memovox Polaris
Introduced in 1963 and released for sale in 1965, the Memovox Polaris combined two hot trends: It was a Compressor-case dive watch and also featured an alarm function and date window, the first dive watch so equipped. Replacing the famous Deep Sea Automatic, the Polaris added a third crown (at 3:00) to operate an internal dive bezel. It also updated the case with EPSA Compressor technology, having a triple case back: The outermost case back was perforated to allow the alarm to be audible; the second caseback snapped on and featured a Compressor gasket, while the inner caseback was struck by the alarm hammer as on other Memovox models.
Like all Compressor models, the Polaris featured crosshatch-inscribed crowns, but this was the only three-crown Compressor. It is also unusual among non-Super Compressors in having multiple crowns: The Super Compressor models from other makers had two crowns, including one to operate an internal dive bezel, but the Polaris lacked the screw-on caseback of those models. The Polaris was also unusually large for a Compressor at 42 mm.
The Memovox Polaris was rated for 200 m (660 ft). The Polaris featured the new Jaeger-LeCoultre Cal. 825, an update to the classic Memovox movements with a date wheel and second-generation automatic winding system.
Memovox Polaris II
In 1971, Jaeger-LeCoultre introduced the next-generation Memovox Polaris II. The chief technical improvement was the introduction of Jaeger-LeCoultre's "Speedbeat" Cal. 916, which operated at 28,000 A/h.
The Polaris II featured a stylish new 43 mm oval case and more-daring dials. A majority of Polaris II watches were destined for the US market and feature a turquoise bezel, "LeCoultre"-signed dial, and "HPG" (High Precision Guarantee) logo. The European market version features a grey bezel and grey "Jaeger LeCoultre GT" (Grand Taille) dial.
Only 1,120 Memovox Polaris II models were produced.