IWC Pilot's Watch Mark XX IW328201

The storyWhy this reference matters

In 1948 the RAF took delivery of the Mk. 11 navigator's watch, catalogued as 6B/346 and built by IWC. Inside was the calibre 89, sitting in a soft-iron inner case, and that case was not a flourish: radar screens threw off magnetic fields strong enough to derange a mechanical watch. The very high contrast dial and the lume came from the same logic, which was to read the time in a dark cockpit and read it first time. That's the whole DNA of the series, settled in one sitting.

IWC built it until 1981 and then let it die. Collectors brought it back: auction demand persuaded the brand to revive the line in 1994, and it hasn't stopped since. Along the way it skipped the XIII, the XIV and the XIX, jumps usually put down to superstition about those numbers. Mark XII, XV, XVI, XVII, XVIII, and in July 2022, the XX.

The Mark XX introduced the calibre 32111: silicon escapement, double-pawl winding and a hundred and twenty hours of reserve. IWC presents it as an in-house movement, though it is produced at ValFleurier's facilities within the same group. With it the case slimmed from 11 to 10.8 mm, water resistance went from 6 to 10 bar, and the lugs curved a little more. Small changes on paper; on the wrist, a considerably better resolved watch than the Mark XVIII.

SpecificationsThe numbers, in one table

IdentificationHow to tell it apart

You tell a Mark XX from a XVIII on the dial, and you have to look. The date window at 3 gained a white background and shifted slightly outwards to line up better with the minute track; the markers at the cardinal points went from square to rectangular; and the numerals moved a touch closer to the centre. Side by side it's obvious. In a single photograph, the white date is the shortcut.

The IW328201 is the black dial. Its launch twin, the IW328203, is blue; silver dials followed in 2023 as the IW328207 on a strap and the IW328208 on a bracelet. The case is 40 mm by 10.8, lug width 20 mm, with the EasX-CHANGE system for tool-free strap changes.

The case back is solid, engraved with a Junkers Ju 52, because underneath sits the soft-iron inner case that shields the movement from magnetism. If somebody offers you a Mark XX with a display back, either it's a different reference or it isn't what it claims to be.

CollectingWhat collectors check

The Mark XX is one of those watches where condition counts for more than the variant, because there are few variants and none is rare. Look at the case: it's brushed almost all over, with a polished bezel, and badly redone brushing gives itself away at once because the grain comes out uneven. The XX's curved lugs are thinner than the XVIII's, so they mark on the edges sooner.

Check the date change. The 32111 has a hundred and twenty hours of reserve, and a watch that has sat for months and then changes the date slowly or reluctantly is asking for a service. While you're there, make sure the crown screws down without odd resistance: on a 10 bar watch, that's the usual way water gets in.

On the five-row bracelet: it's comfortable, but there's no quick micro-adjustment, and you'll often find one swapped between generations precisely because EasX-CHANGE makes that shuffling so easy. If the watch comes with box and papers, check the reference on the paperwork matches the watch before you assume anything.

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