The Concord “Delirium”, derived from the original “thinnest watch in the world”, is a three-millimetre-slim piece of finely crafted jewellery that slips stylishly under any shirt cuff. This “Montres et Bijoux Genève 1989” version comes in diamond-set 18K gold, fitted with a supple leather strap. Sapphire crystal. (CONCORD “Delirium”)