Girard Perregaux Gyromatic

Here is my early 50s Gyromatic with the uncommon diamond shape? Case ...I've seen a old advert with a GP of this type with the heading Pour l'homme de action..so presumably it was a sports watch.Its typical Perregaux inside , another companies movement ( a Schild i think) with the makers logo milled out and thd movement blinged up a bit with better springs.