Entry to the Grand Prix d'Horlogerie de Genève is voluntary and made by the brand. An entry is a watch registered for that year's competition, not a jury verdict, and several large houses including Rolex, Patek Philippe and Omega do not take part at all.
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Movement tier: unclassified · caliber Piaget Cal. 910P (hand-wound, case-integrated, 2mm total watch thickness, world record)
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
41 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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Total watch height is 2mm; any Altiplano Ultimate measuring more than 2.5mm at its thickest point is incorrect.
Known issues in the market
The case back serves as the movement baseplate; there is no separate caseback. Any example with a removable caseback is not a genuine Altiplano Ultimate Concept.
Total watch height is 2mm; use a caliper to verify if available. Any example measuring more than 2.5mm at the thickest point warrants investigation.
Area
What to check
What is correct
Red flag
caseback
Integrated caseback-as-baseplate architecture
No removable caseback; the case back is part of the movement baseplate and is not intended to be opened
Any visible caseback seam; any evidence the caseback was removed or is removable
case
Total watch height measurement
Watch measures approximately 2mm at the thickest point; caliper measurement consistent with specification
Total height significantly above 2mm; any example measuring 3mm or more at the thickest point
crystal
Sapphire crystal on ultra-flat case
Crystal lies essentially flush with the case architecture; any convexity is extremely minimal
Crystal that is visibly domed; any crystal replacement that adds height inconsistent with the 2mm specification
Common legitimate replacements
The Altiplano Ultimate Concept is a technical record holder and collector piece; service must be performed exclusively at Piaget.
Papers and provenance are critical for this model; verify authenticity with Piaget before any transaction.
Expert resources: Piaget Altiplano Ultimate Concept press documentation at piaget.com. TimeZone Piaget subforum for Concept versus standard Altiplano thickness references.
Authentication guide
Last reviewed June 2026
The Altiplano Ultimate Concept is not a conventional watch. Caliber 910P at 2mm total thickness holds the world record for the thinnest mechanical wristwatch. The movement IS the caseback -- there is no separate caseback component. Any watch with a traditional solid or display caseback cannot be a genuine 910P. This is the fastest single authentication check for this reference.
Known reproduction risks
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HIGH RISK
Traditional caseback present
Any separate caseback component -- whether solid, display, or snap-fit
Watch back has the appearance of a conventional case back rather than bare movement
Screw threads visible for a separate caseback
This is an absolute check. If there is a caseback, it is not a 910P. No intermediate states exist. The 910P's movement IS its caseback, and no replica has achieved this architecture.
HIGH RISK
Thickness above 2.5mm
Caliper measurement above 2.5mm total case height
Watch sits visibly proud of a flat surface when placed face-down
Watch feels "normal" in thinness rather than genuinely startling
Dial variants by era
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Era
Description
Identifiers
2020 to present
Extremely minimal dial in silver or gold, with thin applied numerals or indices. The watch is worn as a direct skin contact experience on the wrist -- there are no traditional case walls of conventional thickness. "PIAGET" text is present but the entire object is designed to disappear on the wrist. The titanium case is an unusual material for Piaget, chosen for its strength-to-weight ratio at extreme thinness.
Total thickness of 2.0mm -- thinner than many coins
Titanium case material -- not steel or gold
No separate caseback: the movement plate IS the back of the watch
Extremely minimal dial with no date, no complications
Applied sapphire crystal -- very thin sapphire rather than conventional dome
"PIAGET" in extremely fine text
Service part flags
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Caseback architecture
Original: The 910P has no conventional caseback. The movement back plate serves as the exterior surface of the watch. When you turn the 910P over, you see the movement directly -- there is no separate back plate, no screw threads for a separate caseback, and no display caseback with a sapphire window. The movement metal IS the surface.
Replacement tells
Any traditional solid caseback (screwed or snap-fit) indicates a different watch entirely
Any display caseback with a sapphire window indicates a different watch
Caseback with engravings in the traditional position where a separate piece would screw in
Any visible gap between case body and a separate back component
Total thickness measurement
Original: Using a caliper across the thickest point of the watch: genuine 910P measures 2.0mm. Any reading substantially above 2.5mm indicates a different watch. The measurement should be taken at the sapphire crystal, which represents the maximum height.
Replacement tells
Caliper measurement above 3mm
Watch feels like a normal ultra-thin dress watch rather than the extreme-thinness experience of the 910P
Watch sits more than minimally proud of a flat surface when placed dial-down
Crown position
Original: The 910P has a crown integrated into the case side at 2 o'clock (not the traditional 3 o'clock). This is necessary because the 2mm thickness leaves no room for a conventional crown at 3 o'clock. The crown design is minimal and integrated with the titanium case.
Replacement tells
Crown at 3 o'clock in the conventional position
Crown profile inconsistent with the minimal titanium design
Crown protrudes more than 0.5mm from the case side
Case back markings
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2020 to present
Movement plate (the caseback) bears "PIAGET" and caliber 910P designation
"SWISS MADE"
Reference G0A45502 and serial number engraved on case side or movement plate
"TITANIUM" material designation
Water resistance: 20m
Movement tells
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Caliber 910P is hand-wound manual. There is no automatic rotor of any kind -- the extreme thinness is only possible without a winding mechanism. The crown winds the mainspring directly. A watch claiming to be a 910P that winds automatically from wrist motion has a different movement.
The manual winding feel at 2.0mm of total thickness is unusually light -- the mainspring is necessarily thin, providing a different tactile experience than conventional manual-wind watches.
Service of the 910P requires Piaget authorization. The movement cannot be disassembled by non-specialist watchmakers without risk of deformation. Service history on any grey-market 910P should be scrutinized carefully.
