Rado watch hyperchrome si3n4 ceramic automatic the lightness of the beating heart created with the motto design lightness and performance in mind the new eta calibre a31 alu is the perfect movement for this new ultra light rado watch by using an ebauche movement blank made of aluminium the weight of the movement is significantly reduced compared to ones that traditionally use brass developments have also increased the power reserve offered by the movement by 22 hours offering a minimum