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