Name: Rolex Milgauss (Green Sapphire) 116400GV
Brand: Rolex
SKU: 116400GV

The Milgauss 116400GV is Rolex's anti-magnetic tool watch, built for environments where electromagnetic fields would stop an ordinary movement cold. The green sapphire crystal, orange lightning-bolt seconds hand, and caliber 3131 with a Faraday cage make it technically singular in the catalog, and its discontinuation in 2023 closed a production run with no announced successor.

What it is

The 116400GV launched in 2007 alongside a non-green-crystal variant (116400), reviving the Milgauss name that had been dormant since the 116400's own predecessor, the ref. 1019, was discontinued in 1988. The "GV" suffix stands for "glace verte," French for green glass, referring to the distinctive green-tinted sapphire crystal unique to this reference. Rolex offered three dial configurations: black, Z-blue (a deep cyan with a wave motif), and white; the Z-blue became the most sought-after.

Production continued without significant design changes through 2023, when Rolex quietly discontinued the entire Milgauss line with no public explanation.

Buying notes

Check the crystal carefully: the green tint is subtle and a replaced crystal using standard clear sapphire is easy to miss indoors but obvious in daylight. The orange lightning-bolt seconds hand is a common service replacement target; confirm it is the correct hand, not a substitute from a non-GV variant or third-party supplier. Inspect the dial for moisture intrusion or service-related damage around the sub-dials, since the 100m rating is modest and older examples have seen water exposure.

Confirm the case has not been polished flat; the brushed and polished surfaces on the 116400GV case are distinct and over-polishing destroys the contrast. For bracelet matching, the Oyster bracelet on this reference uses a solid-link construction; check for stretch at the clasp end and confirm the correct folding Oysterlock clasp is present.

Market read

The Z-blue dial variant commands a clear premium over black and white dials, often 15-25% above comparable black-dial examples in full-set condition. Post-discontinuation pricing has firmed modestly but has not spiked dramatically; the Milgauss has a smaller collector base than the Submariner or Daytona, so the market is thinner and moves more slowly. Full-set examples with original box, papers, and hang tags trade meaningfully above watch-only.

White dial examples sit between Z-blue and black in demand, without a strong premium of their own.

Service expectations

The caliber 3131 is mechanically close to the 3130 used in the no-date Submariner, with the addition of the soft-iron inner cage and paramagnetic components; it is well-understood by independent watchmakers. Rolex recommends a 10-year service interval, and the movement is not fragile, but confirming recent service is worth paying for given the moderate price point of the reference. A documented service from a reputable watchmaker adds real resale value here, more so than on higher-demand references where buyers tend to service on receipt regardless.

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In-house manufacture caliber · caliber Rolex Cal. 3131: in-house automatic, 28,800bph, 48h PR, 31j; soft iron inner cage anti-magnetic; used in Milgauss 116400; paramagnetic Parachrom hairspring · 48h power reserve (2 days)

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

The green sapphire crystal and lightning bolt seconds hand are the twin signatures; either replaced or altered is a serious authenticity concern.

Known issues in the market

The green crystal tint must be consistent across its full surface; uneven tinting indicates a replacement crystal.
The lightning bolt seconds hand is a Milgauss-only component; any standard lollipop or baton hand is a replacement.

Area	What to check	What is correct	Red flag
crystal	Green sapphire tint consistency	Uniform green tint visible when viewed from above; tint is subtle but consistent across the entire crystal surface	Uneven tint (darker at edges, clear at center); completely clear crystal indicating a standard sapphire replacement
hands	Lightning bolt seconds hand	Orange lightning bolt shaped seconds hand; no other Rolex reference uses this hand design	Standard lollipop or baton seconds hand; any non-lightning bolt profile on a 116400GV
caseback	Cal. 3131 with soft iron inner cage	Cal. 3131 visible; the soft iron cage is internal and not directly visible but the caliber number confirms the anti-magnetic architecture	Any caliber other than 3131 engraved on the movement

Common legitimate replacements

Green crystal is the most commonly replaced component; a standard clear sapphire replacement is visually obvious.
Lightning bolt seconds hand replacements are uncommon but reduce collector value significantly.

Expert resources: Rolex Milgauss 116400GV product documentation. Rolex watchmaker documentation for Cal. 3131.

Authentication guide

Last reviewed June 2026

The 116400GV is defined by three features no other production Rolex shares: a green-tinted sapphire crystal, an orange lightning bolt seconds hand, and the anti-magnetic inner ferromagnetic cage shielding Cal. 3131. The Z-Blue dial is the most sought-after variant and the most frequently faked. Verify dial color, seconds hand shade, and crystal tint before anything else.

Known reproduction risks

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HIGH RISK

Replica 116400GV watches with incorrect Z-Blue dial color and approximated orange seconds hand.

Z-Blue dial that appears flat and non-iridescent -- a single-angle photo cannot confirm the shifting quality; request video or hands-on confirmation
Dial color that reads as solid blue rather than the blue-green iridescence of the genuine Z-Blue
Orange lightning bolt hand in the wrong shade (red-orange or yellow-orange rather than the production warm orange)
Green crystal tint approximated with a surface coating that shows distinct layer lines or slight flaking at the crystal edge

MEDIUM

Component substitutions on genuine-case examples, particularly crystal and seconds hand swaps.

Clear crystal on a case otherwise consistent with 116400GV production -- crystal replacement is the most common single-component swap
Standard Rolex seconds hand replacing the lightning bolt hand (the lightning bolt profile is distinctive even in a blurry photo)
Non-GV 116400 case or dial combined with GV-specification hands and crystal

Dial variants by era

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Era	Description	Identifiers
2007 to 2023 (Z-Blue dial)	Blue-green iridescent dial with a shifting character depending on light angle. The Z-Blue is the most popular variant and the most commonly misrepresented.	Iridescent blue-green dial that shifts in color as the viewing angle changes -- static flat blue is wrong Orange lightning bolt seconds hand (unique to the Milgauss across the entire Rolex catalog) Green-tinted sapphire crystal -- the tint is subtle at some angles and more pronounced at others; most apparent when viewed from the side Applied hour markers without lume plots -- the Milgauss uses a different marker configuration than the sport models "Milgauss" text in correct font weight for the production era
2007 to 2023 (white "Ice" dial)	Bright white dial variant. Same case, movement, and crystal as the Z-Blue; different secondary market premium.	Bright white dial with white applied hour markers Same orange lightning bolt seconds hand as all 116400GV variants Green sapphire crystal tint present on all GV variants regardless of dial color
2007 to 2023 (black dial)	Black dial variant. Less common than the Z-Blue in the secondary market.	Black dial with applied hour markers Orange lightning bolt seconds hand consistent across all GV variants Green crystal tint -- same specification as all GV examples

Service part flags

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Green sapphire crystal

Original: Green-tinted sapphire crystal. The tint is achieved through a proprietary coating or glass composition applied by Rolex. It reads as a visible green cast from the side and a subtle cool tint when viewed from above.

Replacement tells

Clear sapphire crystal with no green tint -- aftermarket clear crystal substitutions are a confirmed and documented swap on the 116400GV
Green tint that appears as a uniform surface coating (visible flaking or a distinctly two-layer appearance) rather than integrated coloring
Crystal that scratches with a steel tool (genuine sapphire does not)
Tint color that reads as blue rather than green -- some aftermarket crystals approximate but shift toward blue

Orange lightning bolt seconds hand

Original: Seconds hand shaped as a lightning bolt in orange. The profile is asymmetric and immediately recognizable. The orange matches the lume-illuminated accents on the dial.

Replacement tells

Standard thin seconds hand in any color -- any hand other than the lightning bolt profile is a replacement
Lightning bolt hand in red rather than orange -- a different shade from a non-matching source
Yellow or gold-toned lightning bolt -- incorrect color for any production 116400GV
Correct profile but wrong shade of orange: compare to confirmed reference photos; the production orange is warm but not red-orange

Anti-magnetic cage (not externally visible)

Original: Cal. 3131 is enclosed in an inner ferromagnetic cage that shields the movement from magnetic fields to 1,000 gauss. The cage is not visible without opening the caseback.

Replacement tells

Movement responding to a strong magnet held near the case: place a strong magnet near the case; if the rate immediately and dramatically shifts, the inner cage may be absent or a different caliber is present
Caseback opened and Cal. 3235 or other caliber visible instead of Cal. 3131 -- documented movement swaps exist
Service record that does not mention or recognize Cal. 3131 specifically

Case back markings

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2007 to 2023

Solid caseback with Rolex coronet engraved at center
"ROLEX OYSTER PERPETUAL" on the outer ring
"MILGAUSS" in the center band
Serial engraved between the lugs at 6 on earlier examples; rehaut engraving on later production
Reference 116400GV between the lugs at 12 (or on rehaut at 12 on later production)

Movement tells

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Cal. 3131 is a dedicated Milgauss caliber -- it is not interchangeable with Cal. 3130 or 3135 from the sport range. The inner ferromagnetic cage is part of the movement specification.
Cal. 3131 runs at 28,800bph. A timegrapher can confirm this rate. A dramatically different rate after regulation suggests the cage or escapement has been disrupted.
Parachrom hairspring in blue-violet at the balance wheel. A standard steel-colored spring indicates a non-Rolex specification part or wrong caliber.
The bidirectional Perpetual rotor should spin freely. Any lateral wobble or grinding indicates worn rotor bearings.
No date complication: if the crown engages a quickset at position 2:15, the movement has been swapped for a date-series caliber.

Sources: Rolex Forums -- Milgauss 116400GV authentication and Z-Blue dial documentation; WatchCSS -- Milgauss green crystal and lightning bolt hand verification guide; Hodinkee -- Milgauss 116400GV production overview.