Vintage LeCoultre Memovox

I came across this interesting case and dial design in a Jaeger LeCoultre recently in the collection of a friend's magnificent Memovox collection.

The unusual elongated cushion shaped case is rather unique, especially with the oval dial and crystal. Very interesting.

And the unusual blue hue of the dial is mesmerising. The condition of the dial and hands is certainly in line with the age...made by JLC in the 1970s, though it is

I was told this is a high beat movement, marked HPG, running at some 28,800 bph, signed LeCoultre because it was originally intended for the US market.