Rolex

This subject would deserve a medium-size book; however, I think it is interesting to share   some basic information, particularly referring to military watches delivered to UK Forces from the 1950s on.

In the short space of a single work it is impossible to describe all possible situations and every peculiar case.   Owners of eventual exceptions are kindly requested to share them.

WWII and Earlier Engravings

1) British Army

"The British Army has carried the 'Royal' designation since its establishment in 1661 by Charles II following the restoration of the monarchy. Individual regiments and units may earn additional 'Royal' honors for distinguished service, but the army itself has been 'Royal' since its founding."

   
• WWW=Waterproof Wrist Watch, followed by a manufacturer letter (K=Timor, Y=Omega, F=Longines). Sometimes the manufacturer’s name was also engraved.
   
• The Broad Arrow (stylized arrow marking Crown property).
   
• One or two digit series showing the delivery and sometimes case number.
 

↑ Broad Arrow WWWK8211 (delivery number)36791 (case number)  

2) Royal Air Force

   
• Broad Arrow.
   
• Abbreviations: 6B, 6BB, 6A, or 6E, followed by a model/type number.
   
• Year of delivery and progressive assignment number.
   
• Sometimes “AM” (Air Ministry) instead of Broad Arrow on WWII deliveries.
 

AM6B/15910233/40  

Important: Delivery numbers were continuous each year — not restarted from 001.   If the last in 1945 was 6431, then the first in 1946 was 6432. This applied to all UK Forces.

3) Royal Navy (including Royal Marines and Fleet Air Arm)

   
• Broad Arrow.
   
• HS=Hydrographic Service (also used for Royal Marines and other branches).     
         
  • HS 9=wrist chronograph
         
  • HS 10=diver’s watch
       
     
   
• Progressive assignment number and/or case number.
 

↑ Broad ArrowHS 10 CD (Clearance Diver)942.115  

Hybrid Engravings (1950s–1960s)

From the early 1950s, many casebacks carried numbers often wrongly described as NATO codes.   These were actually hybrids, mixing national MOD codes with NATO species codes:

   
• 0552=MOD code for Royal Navy
   
• W10=MOD code for British Army
 

Example: Omega “Fat Arrow”

6645-1010006B-5426850/53  

Example: RN Hamilton Chronograph

0552/924-33061720/72  

Example: RAF Hamilton Chronograph

6BB-5511860/72  

NATO Stock Number Era (mid‑1960s onward)

The NATO Stock Number (NSN) was created for precise classification of all NATO supplies. It has 13 digits:

   
• First 4 digits=species code (6645=wristwatches).
   
• Digits 5–6=country code (99=UK, 12=Germany, 14=France, 15=Italy).
   
• Final 7 digits=random item code, progressive, with no inherent meaning.
 

Examples:

British Army Smith (1970)NSN: 6645-99-961-4045W10-6645-99-961-40451579/70  

Omega SM300 / Rolex MilsubNSN: 6645-99-923-7697W10-6645-99-923-7697288/67  

Royal Navy Rolex 55130552-923-7697199/74  

Royal Navy Omega SM3000552-923-7697577/70  

Footnote: Up to the present day there is no proof that progressive delivery numbers ever restarted   each year at a lower value than the last number issued the previous year.