JLC Mark XI Pilot's Watch

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SKU AS01516
SKU AS01516

Why We Love it

From the earliest days of aviation, watch manufacturers endeavored to develop a timepiece that would allow a pilot to calculate his position at a glance. In 1929 Longines produced a "seconds-setting" watch designed by Philip Weems, a professor from the U.S. Naval Academy. Longines also produced the Hour Angle in 1932, with insight from one of the most renowned aviators to ever take to the skies, Charles Lindbergh.

Like Longines, IWC was among the first brands to establish itself as a manufacturer of aviation watches, starting with the first watch ever developed solely for aviation: the Spezialuhr für Flieger or Special Pilot's Watch, in 1936. But as aviation became militarized, the importance of watches as navigational tools increased. In 1948 the British Ministry of Defense called upon manufacturers to design watches that could meet the rigorous standards required for military use. 

As an answer to the A-11, which was then standard issue for pilot's watches, the MoD issued new standards for the watches going to its RAF pilots. This new standard, coded 6B/346, required chronometer-grade performance and anti-magnetic properties. For the production of this new timepiece, the MoD turned to major European manufactures, eventually giving contracts to two: International Watch Company and Jaeger-LeCoultre, and the resulting timepiece was the Mark XI Pilot's watch.

To ensure that the watch met the requisite anti-magnetic properties, the Mark XI featured a soft iron dial and dust cover which shielded the movement from magnetism. While IWC produced their version of the Mark XI with their existing Calibre 89 (which found its way into many IWC models of the era), Jaeger-LeCoultre filled theirs with a 12.5 ligne, 16-jewel Calibre 488SBr movement. The Calibre 488SBr, which had its beginnings at a modification of the calibre 470, was only used in the Mark XI series, making the JLC executions much more sought after by collectors. Another interesting note about the calibre 488SBr is that a subsequent revision, the Calibre P 478 BWSBr, would later power the Geophysic

The Ministry of Defense spared no expense in guaranteeing that the watches maintained their accuracy. Each watch was subjected to a 44-day testing period at the Royal Greenwich Observatory, which included 14 days in which the watches were tested in five different positions and at two different temperatures. Once the watches passed these rigorous tests, they had to be returned to the Royal Observatory for testing within a year. 

The Mark XI entered military service in 1949 and was decommissioned in 1981. This stunning example was produced in 1948, and its size (slightly small by today's standards) belies the sturdiness and dependability of this robust navigating machine. Reliable to the last, it exemplifies the truest notions of a tool watch. 

A:S Guarantee

+

Our Pledge

Analog:Shift stands behind the authenticity of our products in perpetuity.

Condition

Since our pieces are vintage or pre-owned, please expect wear & patina from usage and age. Please read each item description and examine all product images.

Warranty

We back each Analog:Shift vintage timepiece with a one-year mechanical warranty from the date of purchase.

International Buyers

Please contact us prior to purchase for additional details on shipping and payment options.

Shipping & Returns

+

All of our watches include complementary insured shipping within the 50 states.

Most of our products are on hand and will ship directly from our headquarters in New York City. In some cases, watches will be shipped directly from one of our authorized partners.

We generally ship our products via FedEx, fully insured, within 5 business days of purchase. An adult signature is required for receipt of all packages for insurance purposes. Expedited shipping is available at an additional cost. We are also happy to hand deliver your purchase in Manhattan or you may pick it up at our showroom.

Returns must be sent overnight or by priority international delivery, fully insured and paid for by the customer. A restocking fee may apply. Watches must be returned in the same condition as initially shipped.

We welcome international buyers, please contact us prior to purchase for additional details on shipping and payment options.

JLC Mark XI Pilot's Watch

JLC Mark XI Pilot's Watch

Sold
Sold
JLC Mark XI Pilot's Watch

Why We Love it

From the earliest days of aviation, watch manufacturers endeavored to develop a timepiece that would allow a pilot to calculate his position at a glance. In 1929 Longines produced a "seconds-setting" watch designed by Philip Weems, a professor from the U.S. Naval Academy. Longines also produced the Hour Angle in 1932, with insight from one of the most renowned aviators to ever take to the skies, Charles Lindbergh.

Like Longines, IWC was among the first brands to establish itself as a manufacturer of aviation watches, starting with the first watch ever developed solely for aviation: the Spezialuhr für Flieger or Special Pilot's Watch, in 1936. But as aviation became militarized, the importance of watches as navigational tools increased. In 1948 the British Ministry of Defense called upon manufacturers to design watches that could meet the rigorous standards required for military use. 

As an answer to the A-11, which was then standard issue for pilot's watches, the MoD issued new standards for the watches going to its RAF pilots. This new standard, coded 6B/346, required chronometer-grade performance and anti-magnetic properties. For the production of this new timepiece, the MoD turned to major European manufactures, eventually giving contracts to two: International Watch Company and Jaeger-LeCoultre, and the resulting timepiece was the Mark XI Pilot's watch.

To ensure that the watch met the requisite anti-magnetic properties, the Mark XI featured a soft iron dial and dust cover which shielded the movement from magnetism. While IWC produced their version of the Mark XI with their existing Calibre 89 (which found its way into many IWC models of the era), Jaeger-LeCoultre filled theirs with a 12.5 ligne, 16-jewel Calibre 488SBr movement. The Calibre 488SBr, which had its beginnings at a modification of the calibre 470, was only used in the Mark XI series, making the JLC executions much more sought after by collectors. Another interesting note about the calibre 488SBr is that a subsequent revision, the Calibre P 478 BWSBr, would later power the Geophysic

The Ministry of Defense spared no expense in guaranteeing that the watches maintained their accuracy. Each watch was subjected to a 44-day testing period at the Royal Greenwich Observatory, which included 14 days in which the watches were tested in five different positions and at two different temperatures. Once the watches passed these rigorous tests, they had to be returned to the Royal Observatory for testing within a year. 

The Mark XI entered military service in 1949 and was decommissioned in 1981. This stunning example was produced in 1948, and its size (slightly small by today's standards) belies the sturdiness and dependability of this robust navigating machine. Reliable to the last, it exemplifies the truest notions of a tool watch. 

A:S Guarantee

+

Our Pledge

Analog:Shift stands behind the authenticity of our products in perpetuity.

Condition

Since our pieces are vintage or pre-owned, please expect wear & patina from usage and age. Please read each item description and examine all product images.

Warranty

We back each Analog:Shift vintage timepiece with a one-year mechanical warranty from the date of purchase.

International Buyers

Please contact us prior to purchase for additional details on shipping and payment options.

Shipping & Returns

+

All of our watches include complementary insured shipping within the 50 states.

Most of our products are on hand and will ship directly from our headquarters in New York City. In some cases, watches will be shipped directly from one of our authorized partners.

We generally ship our products via FedEx, fully insured, within 5 business days of purchase. An adult signature is required for receipt of all packages for insurance purposes. Expedited shipping is available at an additional cost. We are also happy to hand deliver your purchase in Manhattan or you may pick it up at our showroom.

Returns must be sent overnight or by priority international delivery, fully insured and paid for by the customer. A restocking fee may apply. Watches must be returned in the same condition as initially shipped.

We welcome international buyers, please contact us prior to purchase for additional details on shipping and payment options.

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