Name: Hermès Slim d'Hermès PM 39.5mm W044819WW00
Brand: Hermès
SKU: W044819WW00

The Slim d'Hermès PM is Hermès's statement that they can do haute horlogerie: an in-house H1950 calibre at 2.6mm thickness, 39.5mm white gold case, and the option of a sapphire dial that lets the movement speak. At this tier you are not buying a Sellita base; the H1950 is a genuine manufacture caliber designed to sit at the heart of the house's most ambitious timepieces.

What it is

Hermès founded their La Montre Hermès manufacture in Biel in 1978, but in-house caliber development at a genuine level came later. The H1950 calibre, introduced in 2012 for the Slim d'Hermès line, was the house's first fully in-house ultra-slim movement: 2.6mm thin, manual-wind, with a power reserve of 42 hours. The PM designation (Petite Modèle) refers to the 39.5mm case diameter, which places it in the dress-watch sweet spot.

The white gold case and sapphire dial options reflect Hermès's jewelry heritage as much as their watch ambitions.

Buying notes

Ultra-slim movements are inherently more vulnerable to shock than thicker calibers; the H1950 at 2.6mm is not a watch to wear while playing sport. The manual-wind requirement means daily attention; set a routine or expect to reset the time regularly. White gold cases are soft and scratch visibly; buying a used example requires careful inspection under magnification.

At this price tier, provenance documentation and service history are non-negotiable.

Market read

The Slim d'Hermès PM in white gold retails above $10,000 and can exceed $20,000 with sapphire dial. Secondary-market pricing reflects the in-house movement and precious-metal case: this is not a watch that trades on volume platforms. Specialist auction houses and vetted dealers are the correct channels.

Hermès's position as a genuine luxury house with controlled distribution supports secondary values better than mid-tier fashion brands with similar movement specs.

Service expectations

Service must go through Hermès's authorized network or a watchmaker with specific H1950 training and parts access. The ultra-slim architecture requires particular skill to disassemble and reassemble without damage; this is not a movement to hand to a generalist. Service interval is approximately five to seven years.

Budget for significant service cost consistent with the watch's retail tier.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

Mass-produced

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Movement tier: unclassified · caliber Hermes Cal. H1950: in-house ultra-thin automatic, 21,600bph, 50h PR; used in Slim d'Hermes PM; Hermes thin movement for the iconic slim rectangular case · 50h power reserve (2.1 days)

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

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

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Authentication

Flush integrated leather strap attachment is Hermes-specific; any non-flush strap attachment is a modification.

Known issues in the market

The PM (Petite Modele) designation means the smaller case; verify case dimensions match PM specs.
The ultra-thin Cal. H1950 produces a visibly slim case profile; any Slim d'Hermes that appears thick has a movement swap.

Area	What to check	What is correct	Red flag
bracelet	Integrated strap attachment	Flush Hermes integrated leather strap attachment; no visible lug hardware	Non-flush strap attachment or standard spring-bar lugs; modification from original
case	Ultra-thin case profile	Visibly slim case profile consistent with Cal. H1950 movement height	Noticeably thicker case profile; movement replacement with a thicker caliber
caseback	H1950 in-house movement	Hermes H1950 in-house ultra-thin movement through caseback	Non-in-house movement architecture; movement swap

Common legitimate replacements

Leather strap; Hermes OEM only; integrated attachment is non-standard.
Crystal; sapphire standard.

Expert resources: Hermes authorized service; Hermes Slim d'Hermes product documentation.

Authentication guide

Last reviewed June 2026

The Slim d'Hermès PM is an ultra-thin dress watch built around the in-house H1950 movement. The integrated H motif on the dial and extreme thinness are the primary identifiers.

Known reproduction risks

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MEDIUM

The Slim d'Hermès is a prestige piece attracting replica production, though the ultra-thin case and in-house movement are difficult to replicate.

Replica cases are notably thicker than spec; the ultra-thin profile is the first check
The H at 12 on replicas is typically applied (raised) rather than in-plane; run a finger across the dial to check
"Hermès Paris" typeface on replicas shows the same letterform issues as other Hermès replicas

Measure the case thickness if possible; genuine Slim d'Hermès PM is under 7mm. Replicas run 9-11mm.

Dial variants by era

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Era	Description	Identifiers
2015 to present	PM size (approximately 32-39mm depending on year). Ultra-thin case under 7mm. The H letterform is integrated into the 12 o'clock marker position on the dial. Roman numeral chapter ring on most variants.	The H at 12 o'clock is not a separate applied element; it is part of the dial design and sits in the same plane as the chapter ring "Hermès Paris" in fine print on the dial Extreme thinness: the watch should be noticeably thinner than any ETA-based dress watch of similar diameter

Service part flags

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Movement

Original: In-house H1950 caliber; this is the primary value-bearing component.

Replacement tells

Any non-H1950 movement in a Slim d'Hermès PM is incorrect; verify by reading the caseback or requesting service history
A thicker case than specified suggests a different (thicker) movement has been installed

Dial

Original: The H at 12 is integral; dial cannot be replaced without losing the defining design element.

Replacement tells

Applied H marker (raised, separate from the dial surface) is not original; the genuine H is in-plane
Replaced dial will lack the case-matching serial documentation

Case back markings

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2015 to present

"Hermès Paris" and "Swiss Made"
"H1950" movement designation
Reference and serial numbers
Case material (steel or gold); PM and GM size designations
Water resistance (30M typical)

Movement tells

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H1950 is a proprietary Hermès movement; parts are available only through authorized Hermès service.
Ultra-thin movements are more sensitive to shock; a Slim d'Hermès that has been dropped may show rate instability before any visible damage.
Power reserve is approximately 40 hours; a piece stopping before 35 hours when fully wound needs service.
The movement is hand-wound on most Slim d'Hermès PM references; there is no automatic winding rotor. Any internal rotor sound when the watch is tilted indicates a wrong movement.

Sources: Hermès Slim d'Hermès product page.