IWC
Mark XI | 6B/346 | steel

RAF-issued

Regular price £6,500

Click for 360° view

IWC
Mark XI | 6B/346 | steel

RAF-issued

Regular price £6,500

This iconic, RAF issued IWC Mark XI (ref. 6B/346) is in fantastic vintage condition and has perfect mechanical functionality. It has been fully-serviced, ensuring the watch is in excellent working order.

This IWC Mark XI is from 1948 and retains all of its military case-back engravings. The movement serial number “1149XXX’ dates it to 1948, matching the case year. The dial features the British military broad arrow and the circled ‘T’, indicating that tritium was used for the luminous material. The original dial of the Mark XIs were lumed with radium, however these were later replaced with tritium (by IWC) in the 1960s, as it was less radioactive and far safer. Many collectors do indeed prefer the look of the replaced ‘T’ dials, compared to the radium ones.

In 1948, the RAF ordered two separate batches of Mark XIs, with the calibre 89 ‘anglo’ or ‘angleterre’ (of which this is one), without ‘Incabloc’. The ‘anglo’ designation, helped to distinguish regular Cal. 89s (with Incabloc), from those without shock-protection. At the time, the RAF believed the Cal. 89 to be more accurate without shock-protection, thus sacrificing Incabloc in favour of the most precise method of timekeeping.

Housed in a 36mm stainless steel case with fixed lugs, it has antimagnetic hands and an antimagnetic cage protecting the famous manual winding Cal. 89 movement, beating at 18,000 A/h. IWC Mark XIs were renowned for their timekeeping accuracy, as this was a fundamental specification required by the British Armed Forces. As a result, these watches were regulated in five positions and tested in temperatures ranging from -5 degrees to 46 degrees over a 44 day testing period, in order to meet the required standards.

Mark XIs were made for BOAC (British Overseas Airline Corporation), the RAF (Royal Air Force), the Royal Australian Air Force as well as other air forces and for civilians as well. The collectibility of this timepiece is largely underpinned by its historical significance, as IWC’s entire modern Pilot range was largely inspired by the original Mark XI. With pilots watches very much in demand today, due to their casual and utilitarian feel, this particular piece certainly fits the bill, especially with its wearable 36mm case.

Viewings can be arranged in Central London by appointment.

Brand: IWC
Model: Mark XI Ref. 6B/346
Movement: mechanical manual-winding Cal. 89
Functions: time-only: hours, minutes, center seconds
Features: unrestored tritium dial
Case: 36 mm stainless steel
Crystal: plexiglass
Bracelet: NATO strap
Year: 1948
Box & papers: N/A
This vintage IWC Mark XI has an unrestored dial. The bezel and the case are lightly scratched, appropriate to the age of the watch, with defined graining on the case sides and lugs, and visible tarnishing on the reverse of the bottom left lug. The watch is guaranteed for authenticity and comes with a two-year warranty from A Collected Man.

All of our pre-owned watches have undergone thorough mechanical inspections, including being ultrasonically cleaned, serviced and resealed if appropriate and tested for at least four days, to ensure they meet our highest timekeeping standards. Our pre-owned and vintage watches are covered by a full, or a limited twenty-four month warranty. For example, due to their age, some vintage watches should not be subjected to the same conditions as when they were new. Please see our Terms & Conditions for further information. 

All of our new watches are covered by the warranty from the original manufacturer. Please contact us for further information.

We offer worldwide delivery on all of our watches.

If ordering from the UK or Europe before 1 PM, your watch will be sent the same working day. The courier will depend on the value of the watch, with all watches delivered the next working day.

If ordering from outside Europe, delivery will depend on choice of courier and destination. 

You can cancel your order without giving any reason, within 14 days from the day the watch has been delivered to you.

A Collected Man

A Collected Man

We offer a bespoke service

Learn More