IWC Portugieser Perpetual Calendar 5021 White Gold IW5021-21

The case is 44.2 mm across and 15.5 mm thick, with a sapphire crystal and a 22 mm lug width, so it takes a 22 mm strap. Arabic numerals and feuille hands sit on the blue dial.

Its closest relative is the Perpetual Calendar 5032 IW5032-03, also white gold with a blue dial in the same 44.2 mm, 15.5 mm case. Within the 5021 reference, the Luis Figo edition IW5021-20 is rose gold with a black dial, and the IW5021-05 is yellow gold. The Double Moon IW5034-01 keeps white gold and blue in a case 15.3 mm thick, while the IW5023-03 is white gold with a grey Ardoise dial.