In 1972, Rolex secured the contract to supply the UK Ministry of Defense (MoD) with specially modified Submariners for use by the Royal Navy and British Army. Between 1972 and 1979, approximately 1,200 examples — now collectively known as “Milsubs” — were produced. These watches were adapted by Rolex to meet strict MoD specifications, resulting in a uniquely purpose-built Submariner featuring fixed bars, sword hands, a fully graduated 60-minute bezel insert, and a circled “T” on the dial denoting the use of safer tritium luminous material.

Across the entire production period, three references define the Milsub lineage: the 5513, the double-reference 5513/17, and the 5517. Several dial variants were used throughout, but when collectors speak of the ultimate Milsub, the reference 5517 W10 Maxi stands above all others. It is both the least produced and the most clearly defined of the group. Like the COMEX 5514, the 5517 was manufactured exclusively for institutional use and never sold publicly, making it a reference intrinsically tied to its original military purpose. Universally recognized as the Milsub, the W10 engraving on the caseback signifies direct issuance to the British Army and the SAS—Britain’s elite and highly secretive special forces unit — adding an exceptional layer of provenance. Further elevating its status, only a small number of 5517s were fitted with Maxi dials. Beyond their extreme rarity, these dials are visually arresting, distinguished by oversized luminous plots, a taller handset, and bold, crisp printing. 

If the 5517 Maxi is widely regarded as the grail Milsub, the example presented here is not merely one that checks every expected box — it is one whose preservation and provenance place it among the very finest Milsubs known to exist.

The 5.3 million-serial case remains unpolished and exceptionally well preserved, remarkable given years of active field use. Most Milsubs endured heavy service, and upon decommissioning were often polished to remove both wear and the issuance engravings on the caseback. In contrast, this example retains sharp geometry, with the dial and hands remaining entirely original and having aged into a rich, even patina of exceptional appeal. The caseback engravings — including the W10 designation, issue number, and year — are all crisp and clearly legible. Particularly compelling is the permanent imprint left by the original NATO strap, a subtle yet powerful reminder of its service history.

Accompanied by its original Henry Hudson letter and Rolex documentation, this watch’s significance is further reinforced by its presence in some of the most important collections in the world. Having also achieved a world-record result for any Milsub on the global stage, its reputation is firmly cemented, securing its place among the most important Rolex wristwatches known to exist.

(Item: INVDBV_77)