Name: Oris Big Crown ProPilot X Calibre 400 01 400 7778 7153-Set7 22 15TLC
Brand: Oris
SKU: 01 400 7778 7153-Set7 22 15TLC

The Big Crown ProPilot X Calibre 400 is Oris's most consequential watch in decades: a 39mm skeletal pilot built around their first fully in-house movement. The Cal. 400 changes what Oris is, not just what they sell. If you want an in-house movement from an independent Swiss maker at a price that doesn't require a second mortgage, this is the reference to know.

What it is

Oris introduced the Cal. 400 and the ProPilot X together in 2020, with retail availability arriving in 2021. The movement was years in development and represents Oris's break from relying entirely on ETA and Sellita base calibers. The skeletal dial was chosen specifically to put the movement on display, which makes commercial sense: when your core selling point is the movement itself, you show it.

Oris has since expanded Cal. 400 across several lines, but the ProPilot X remains the reference that announced the caliber to the market. No significant generation changes have been made to the ref. 01 400 7778 7153 since launch.

Buying notes

Inspect the open dial carefully for debris or fingerprints on the movement; the skeletal design leaves the bridges and rotor exposed and more vulnerable to contamination during service or careless handling by prior owners. The titanium case is lightweight and comfortable but will show fine scratches faster than steel, so check the lugs and case flanks on any pre-owned example. Oris specifies a 5-year service interval, so ask for documentation on any used piece and factor in the service date.

Confirm whether the piece comes on the titanium bracelet or textile strap, since the bracelet commands a small premium on the secondary market and is harder to source separately. The crown at 9 o'clock is a design feature of the pilot heritage, not a defect, but verify crown sealing is intact if the watch has seen heavy use.

Market read

New retail is around $3,000 to $3,500 USD depending on strap configuration and regional pricing. Pre-owned examples trade at or slightly below retail, since supply is healthy and the novelty premium has normalized since the 2021 launch. The titanium bracelet version holds its value slightly better than the textile strap configuration.

No meaningful speculative premium exists here: this is a watch you buy to wear, priced fairly for what it delivers.

Service expectations

The Cal. 400 carries a 10-year warranty from Oris and a stated 5-year service interval, both unusually generous for the price tier. Oris authorized service centers handle the caliber; expect service costs in the $300 to $500 USD range for a full service, though this will vary by region and whether parts need replacement. Keep your warranty card and purchase documentation, as the 10-year warranty is transferable and meaningful for resale.

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#1 in family

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Movement tier: unclassified · caliber Oris Cal. 400: fully in-house automatic, 28,800bph, 120h (5-day) PR, 26j; silicon escapement, triple barrel; Oris first true manufacture caliber · 120h power reserve (5 days)

Versatile size: fits most wrists (6–7.5 in / 15–19 cm)

39 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.

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Authentication

Cal. 400 vs Cal. 733 movement swap is the key authentication risk; verify caliber through caseback.

Known issues in the market

Cal. 400 and Cal. 733 share the same case on some ProPilot variants; caseback verification is essential.
Silicon escapement in Cal. 400 requires no oil and has longer service intervals than conventional movements.

Area	What to check	What is correct	Red flag
caseback	Cal. 400 vs Cal. 733 identity	Cal. 400 designation; Oris in-house architecture with silicon escapement visible	Cal. 733 (Sellita SW200-1 base) in a watch described as Cal. 400; premium paid for non-premium movement
movement	Power reserve indication	5-day (120h) power reserve on Cal. 400; subdial or crown indicator showing reserve level	Power reserve depletes in under 40 hours; indicates Cal. 733 installed instead of Cal. 400
dial	Cal. 400 dial designation	Dial explicitly marked "Calibre 400" on Cal. 400 references	No Calibre 400 designation on dial when documentation indicates it should be present

Common legitimate replacements

Rubber strap; Oris OEM for ProPilot.
Crystal; anti-reflective sapphire standard.

Expert resources: Oris Big Crown ProPilot X Cal. 400 press materials. Oris Cal. 400 in-house movement documentation.

Authentication guide

Last reviewed June 2026

Oris Big Crown ProPilot X Calibre 400 (ref. 01 400 7778 7153-Set7 22 15TLC), Cal. 400 in-house movement. Oris's manufacture caliber: 5-day power reserve, silicon escapement, anti-magnetic. Titanium case with integrated bracelet. The Cal. 400 is the primary authentication anchor.

Known reproduction risks

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HIGH RISK

The Cal. 400 is in-house and cannot be replicated in low-cost reproductions. The risk is a genuine ProPilot X case fitted with a non-Cal.400 movement and sold as the Cal.400 spec.

Power reserve indicator showing less than 5-day range (2-day or 40-hour max) indicates wrong movement
Triple barrel cluster absent when caseback is opened
Silicon hairspring absent (steel spring is gold-colored, silicon is blue-grey)
Weight difference: Cal. 400 in titanium case is noticeably lighter than any steel-cased alternative

Always verify the power reserve indicator advances correctly from full wind. At 120 hours, a genuine Cal. 400 takes significantly longer to fully discharge than a standard 38-hour movement.

Dial variants by era

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Era	Description	Identifiers
2021 to present	Current production. Skeletonized or open-dial design showing the Cal. 400 movement below. The 5-day power reserve indicator is visible at 6 o'clock.	Power reserve indicator at 6 o'clock (5-day / 120-hour scale) Titanium case and bracelet with integrated taper Open-worked or skeletonized dial showing movement architecture "ProPilot X Calibre 400" text on dial or caseback Oversized Oris crown in titanium

Service part flags

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Movement (Cal. 400)

Original: Fully in-house Cal. 400. Three barrels (triple barrel) providing 120-hour power reserve. Silicon escapement visible if dial is open-worked. Power reserve indicator at 6 o'clock on the dial.

Replacement tells

Power reserve indicator present but reading maximum 38-42 hours indicates a Cal. 733 or similar swap
Power reserve indicator absent entirely
Movement viewed through caseback shows two barrels instead of three
Non-silicon hairspring (steel hairspring lacks the blue-green hue of silicon under light)

Case and Bracelet

Original: Titanium case with integrated bracelet. The bracelet taper is factory-integrated, not an aftermarket addition.

Replacement tells

Steel bracelet on a claimed titanium example (titanium is notably lighter)
Non-integrated end links with visible gap at the case junction
Bracelet with wrong finishing (all-polished on a brushed-spec piece)

Case back markings

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2021 to present

"ORIS CALIBRE 400" on caseback or movement rotor
Cal. 400 rotor visible through display caseback
"5 DAYS" or "120 H" power reserve notation
Reference and serial number
"TITANIUM" or "Ti" marking
"SWISS MADE"

Movement tells

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Cal. 400 runs at 28,800 bph. The triple barrel assembly is visually distinctive: the barrel cluster appears larger and more complex than a single-barrel ETA or Sellita when viewed through the caseback.
The silicon balance spring is blue-grey in color rather than the gold of a steel spring. Under magnification this is a clear discriminator.
The anti-magnetic rating (up to 2,000 Gauss per Oris spec) is achieved by the silicon escapement. A movement swapped to a Cal. 733 loses this property.
Oris service intervals for the Cal. 400 are specified at 10 years due to self-lubricating escapement geometry. Service records claiming earlier intervals should not raise concern, but unexpectedly early service could indicate the movement is not original.

Sources: Monochrome Watches — Oris ProPilot X Calibre 400; Oris official — Cal. 400.