The anniversary night blue on steel with a diamond bezel is the most-requested combination of the 37 mm run, and the reason is contrast — the dial is nearly black in low light and the stones are the only thing that reads at a distance. Bleu nuit nuage 50 was mixed for the fiftieth year.

The stainless steel case measures 37 mm with a diamond bezel. The Bleu nuit nuage 50 dial carries the Grande Tapisserie pattern with white gold applied hour-markers and Royal Oak hands, showing hours, minutes, centre seconds and a date. The watch is completed on an integrated stainless steel bracelet with an AP folding clasp. Part of the Royal Oak collection, in the size the design was originally drawn closest to.

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