Louis Erard Watch Excellence Triptych Regulator 85237AA21.BVA31. The Louis Erard watches Excellence Triptych has its own technical and aesthetic defining features. But they are all built in the same spirit, with common aspects between them, such as a family portrait spanning several generations. The cases sport the roundness of old pocket watches, although tightened by sapphire crystal, which projects slightly beyond the case, giving the overall piece a highly modern style. The matt silver dials are reminiscent of the elegant simplicity of the 1950s, but revitalised with shifting levels and contrasting finishes: satin finished, brushed, snailed and diamond cut. And each detail has been finely crafted, from the typography and metal index to the hand bushings, in order to produce an original, groundbreaking and decidedly contemporary result. All with the natural, sensual touch of the chocolate calf nubuck leather strap.