Ask an experienced collector about a watch and they will answer in reference numbers, not model names. That is because a Rolex reference tells you almost everything that matters — the era, the case, the bezel, the dial and the movement inside. Learn to read one and you can spot when a watch has been described loosely, mismatched, or quietly upgraded. Here is how the code works, starting with the question we get most: what does the “M” in 14060M actually mean?
The number of digits tells you the era
- Four digits (e.g. 5513, 1675): vintage Rolex, broadly pre-1980s.
- Five digits (e.g. 16610, 14060): the “modern-vintage” era, roughly late 1970s to around 2010.
- Six digits (e.g. 116610, 126610): the current era, from the 2000s onward.
When Rolex adds a leading digit — 16610 becoming 116610, then 126610 — it signals a new generation with an updated case and movement. Each step is a genuinely different watch, not just a cosmetic tweak.
The “M” suffix: same reference, upgraded movement
The “M” was Rolex’s way of marking a movement or generation update within an existing reference. The classic example is the No-Date Submariner: the 14060 used calibre 3000, and around the turn of the millennium it became the 14060M, fitted with the improved calibre 3130 — a movement with a larger balance wheel, a full balance bridge and a Breguet overcoil for better stability. The Air-King told the same story: the 14000 (calibre 3000) became the 14000M (calibre 3130). Same watch, same looks — a better engine inside.
The hidden twist inside the 14060M
Here is the detail that catches buyers out. The 14060M ran for over a decade, and partway through its life it changed again — this time on the dial. From roughly 2001 to mid-2007 the 14060M had a two-line dial. In summer 2007 the reference gained official COSC chronometer certification, and its dial became a four-liner reading “Superlative Chronometer Officially Certified”. It is the same 14060M reference, but the later four-line, COSC-certified version typically trades at a premium. So “14060M” alone does not fully describe the watch — you also need to know which dial it carries.
The letters after the number: colour and material codes
Suffix letters, mostly from French, describe the bezel or dial:
- LN — Lunette Noire, black bezel (e.g. Submariner 116610LN).
- LV — Lunette Verte, green bezel (the “Hulk” and “Kermit” Submariners).
- BLRO — Bleu/Rouge, the blue-and-red “Pepsi” GMT bezel (126710BLRO).
- BLNR — Bleu/Noir, the blue-and-black “Batman” GMT bezel (116710BLNR).
- CHNR — brown/black, the “Root Beer” GMT.
So 126710BLRO is not jargon — it is a precise description: sixth-generation GMT-Master II with the blue/red Pepsi bezel.
Why this matters when you buy
Reference literacy protects your money. It lets you confirm that the dial, bezel and movement in front of you actually match the reference the seller claims — a mismatch is the single biggest sign of a “frankenwatch” or a misdescribed watch. It also explains price gaps that look mysterious from the outside: a four-line 14060M over a two-liner, a six-digit ceramic model over its five-digit predecessor, a rare colour code over a common one. When you know exactly what a reference should contain, you know exactly what you are paying for.
Reference-reading checklist
- Count the digits to place the era; a leading “1” added means a newer generation.
- Note any letter suffix (M for a movement update; LN, LV, BLRO, BLNR, CHNR for bezel colour).
- Confirm the dial, bezel, bracelet and calibre all match that exact reference.
- On a 14060M, check whether it is a two-liner or a COSC four-liner.
- Cross-check the reference against the serial and the era it should belong to.
How GrecoWatch can help
GrecoWatch is an Athens-based luxury watch specialist and a Chrono24 Trusted Seller. We authenticate every watch reference by reference — confirming the dial, bezel and movement all belong together — so you know exactly what you are buying. Private viewings by appointment and insured worldwide shipping.
Frequently Asked Questions
What does the “M” in Rolex 14060M mean?
It marks a movement update within the same reference. The Submariner 14060 used calibre 3000; the 14060M was fitted with the improved calibre 3130. The watch looks the same but has a better movement inside.
Is a 14060M better than a 14060?
The 14060M has the more modern calibre 3130 (larger balance wheel, full balance bridge, Breguet overcoil). Both are excellent; the 14060M is generally seen as the more refined engine, and later COSC-certified four-line examples carry a premium.
What do letters like LN, LV, BLRO and BLNR mean?
They are mostly French colour codes for the bezel: LN is black (Lunette Noire), LV is green (Lunette Verte), BLRO is the blue/red “Pepsi”, BLNR is the blue/black “Batman”, and CHNR is the brown/black “Root Beer”.
Why do reference numbers matter when buying a Rolex?
Because the reference defines the watch. Knowing it lets you confirm the dial, bezel and movement all match — the best defence against mismatched “frankenwatches” and misdescribed listings — and explains the price differences between generations and variants.
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