Atlas GMT

Premium $1,300+

The Monta Atlas GMT is a 38.5mm Swiss-made tool watch powered by the brand's in-house-branded M-23 automatic, offering a caller-style 24-hour GMT hand, date at 6 o'clock, and 150m water resistance in a 316L stainless steel case with sapphire exhibition caseback. Priced at $2,150 on a steel bracelet, it competes in the sub-$3,000 GMT segment across three dial variants — Charcoal, Opalin Silver, and Monta Blue.

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38.5mm

Case

150m

Water res.

10.7mm

Thick

47mm

Lug-to-lug

Overview

Brand	Monta
Reference	168CH00SB
Collection	Atlas
Category	GMT
Released	2019
Price guide	Premium · $1,300+

Full specification

Specs

Case & dial

Diameter	38.5 mm
Lug-to-lug	47 mm
Thickness	10.7 mm
Lug width	20 mm
Water resistance	150 m
Crystal	sapphire
Case material	stainless steel
Bezel	fixed, brushed radial/sunburst
Case back	exhibition

Movement & furniture

Type	Automatic
Caliber	Monta M-23 →
Functions	Date, GMT (24h hand)
Power reserve	56 h
Jewels	25
Lume	Super-LumiNova BGW9
Strap / bracelet	steel bracelet

On the wrist

Forty-seven millimetres lug-to-lug in a 10.7mm-thick package means the Atlas sits flush against the wrist and disappears under a dress-shirt cuff — a practical advantage that full-size GMTs cannot match. The brushed sunburst bezel, polished-bevel lugs, and sunburst dial create a play of textures that reads as dressy in a boardroom and capable outdoors; it lands closer to the refined end of the sport-watch spectrum, not the hardcore tool-obsessive end.

The BGW9 lume fills the rhodium-plated sword hands generously enough for a reliable icy-blue glow, and the 24h GMT hand's red tip gives you the visual hook needed to scan it at a glance. Where some owners will feel a nagging absence is at the crown: there is no flyer-GMT trick here, no quick local-hour setting to satisfy the jet-setter. The Atlas rewards those who appreciate understated execution and treat the 24h hand as an AM/PM reference or a convenient time-zone reader rather than a mission-critical complication.

Bottom line

A well-finished, compact GMT that delivers genuine tool-watch credentials and bracelet quality well above its price class, though buyers who need an independently settable local-time (flyer-GMT) hand will need to look elsewhere.

Highlights

38.5mm / 47mm L2L — slim, versatile fit
Caller GMT 24h hand + date
M-23 auto, 56h power reserve
Sapphire exhibition caseback
150m / screw-down crown & caseback

Who it's for

Wrists roughly 155–175mm who want a slim, dress-capable daily GMT that transitions from business to weekend travel without calling attention to itself. Best for wearers who reference a single home time zone and appreciate the 24h hand as a quick AM/PM indicator or second-timezone reader rather than a mechanism for rapid tz hopping.

Who should skip it

Skip it if you need an independently settable local-time flyer-GMT hand, want water resistance above 150m, or prefer a rotating 24h bezel over a fixed one.

Before you buy

Three dial variants (Charcoal 168CH00SB, Monta Blue 168MB00SB, Opalin Silver 168OP00SB) — confirm the exact SKU before ordering
Caller GMT only: the 24h hand is linked to local time; local hour cannot be advanced independently while the movement runs
Low stock on the official site as of mid-2026 — verify current availability directly with Monta before purchasing
Older reviews citing 10.2mm thickness reference the earlier SW330 production; current M-23 spec is 10.7mm

FAQ

Is the Atlas GMT automatic or quartz?

It runs a automatic movement.

What movement does the Atlas GMT use?

The Monta M-23 (Monta).

Does the Atlas GMT have a date?

Yes.

How water resistant is the Atlas GMT?

It is rated to 150 m.

How big does the Atlas GMT wear?

38.5 mm wide with a 47 mm lug-to-lug.

Is the Atlas GMT a flyer GMT, or does it use a caller setup?

Caller GMT. The 24h hand tracks local time on a 24h chapter-ring scale so you can read a reference time zone, but the local hour hand cannot be independently set in one-hour jumps while the movement continues running.

How does the Atlas GMT stack up against Swiss GMTs in the same price range?

At $2,150 it sits between the Tissot PRX GMT and Longines Spirit Zulu Time. Reviewers consistently rate its case finishing, bracelet construction, and clasp quality above the price point — the beveled links and quick-adjust clasp draw frequent comparisons to far more expensive Swiss references — though it carries less legacy brand cachet.

Did Monta ever sell the Atlas GMT with a different movement?

Yes. The original Atlas GMT launched around 2019 with a Sellita SW330-based caliber at roughly $1,615–$1,795. Monta later upgraded to the in-house-branded M-23 (tuned to a 56h reserve), raising the price to $2,150.