One of the most significant wristwatches ever made by Patek Philippe, the very existence of this highly important timepiece was, until recently, unknown to the market. Named with the unique and previously unrecorded reference number 5001 T, this magnificent wristwatch utilizes Patek Philippe’s most complex wristwatch movement calibre that is housed in a specially commissioned Titanium case with bespoke ‘basket-weave’ (panier) dial. The Ref. 5001 is a bespoke variation on the firm's famed Ref. 5002, which was produced in platinum, yellow, white and pink gold. In the same manner that collectors of vintage watches fall into a collective swoon upon the discovery of a vintage perpetual calendar wristwatch cased in stainless steel, so too will future generations delight over the discovery of the present exceedingly complicated watch in titanium.