Oris Aquis Date Calibre 400 vs Raymond Weil Freelancer Open Heart
Oris's diver meets Raymond Weil's timepiece
Quick Verdict
The Raymond Weil Freelancer Open Heart ($1,500–$2,500) delivers Automatic (Sellita SW200 base) technology in the tier below the Oris Aquis Date Calibre 400 ($2,500–$5,000). The Freelancer Open Heart measures 42mm and is rated 100m (10 ATM). The Aquis Date Calibre 400 justifies its premium with Swiss Made heritage and Automatic Calibre 400. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Oris Aquis Date Calibre 400 | Raymond Weil Freelancer Open Heart |
|---|---|---|
| Price | $2,500–$5,000 | $1,500–$2,500 |
| Case Size | 41.5mm | 42mm |
| Movement | Automatic Calibre 400 | Automatic Caliber RW4200 |
| Caliber Type | Oris In-House Manufacture | Automatic (Sellita SW200 base) |
| Power Reserve | 120 Hours (5 Days) | 38 Hours |
| Water Resistance | 300m (30 ATM) | 100m (10 ATM) |
| Crystal | Sapphire Crystal with Anti-Reflective Coating | Sapphire with Antiglare |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Oris's design language vs Raymond Weil's approach
The Oris Aquis Date Calibre 400 features a Stainless Steel case at 41.5mm with Sapphire Crystal with Anti-Reflective Coating protection. The Raymond Weil Freelancer Open Heart offers Stainless Steel construction at 42mm with Sapphire with Antiglare. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Calibre 400 vs Automatic Caliber RW4200
The Aquis Date Calibre 400 runs the Automatic Calibre 400 (Oris In-House Manufacture, 120 Hours (5 Days) power reserve) at 28,800 vph (4 Hz) frequency. The Freelancer Open Heart uses the Automatic Caliber RW4200 (Automatic (Sellita SW200 base), 38 Hours reserve) at 28,800 vph (4 Hz). The Aquis Date Calibre 400 edges ahead on power reserve.
Wearability & Fit
41.5mm vs 42mm — different wrist presence
At 41.5mm, the Aquis Date Calibre 400 wears more compactly on smaller wrists compared to the Freelancer Open Heart at 42mm. Water resistance differs: 300m (30 ATM) vs 100m (10 ATM).
Value & Cost of Ownership
Raymond Weil sits in the lower tier
The Oris Aquis Date Calibre 400 sits at $2,500–$5,000 and the Raymond Weil Freelancer Open Heart at $1,500–$2,500. On the specs that outlast any price: the Aquis Date Calibre 400 uses Sapphire Crystal with Anti-Reflective Coating with 120 Hours (5 Days), against Sapphire with Antiglare and 38 Hours on the Freelancer Open Heart. Service intervals are typically 5-7 years for both.
Water Resistance
300m (30 ATM) vs 100m (10 ATM)
The Aquis Date Calibre 400 is rated to 300m (30 ATM) while the Freelancer Open Heart handles 100m (10 ATM). The Aquis Date Calibre 400 is better suited for water activities.
Materials Face-Off
| Component | Oris Aquis Date Calibre 400 | Raymond Weil Freelancer Open Heart |
|---|---|---|
| Movement | Oris Caliber 733 | Medical-grade 316L stainless steel with alloy composition: Fe (~65%), Cr (16–18%), Ni (10–14%), Mo (2–3%), Mn (≤2%), C (≤0.03%). Mixed finishing — polished bezel, case flanks, and bracelet center links with satin-brushed outer surfaces. |
| Crystal | Domed sapphire with anti-reflective coating on inside | Synthetic corundum crystal (Mohs hardness 9) with dual-sided anti-reflective coating — applied to both the front crystal and the exhibition caseback sapphire. This dual coating reduces glare for optimal viewing of both the dial-side open-heart aperture and the rear movement view. |
| Case | Stainless steel 316L (brushed and polished) | Stainless steel H-link bracelet with polished center links and brushed outer links. Butterfly deployant clasp with push-button release. |
| Bezel | Unidirectional rotating, scratch-resistant ceramic insert with 60-min dive scale and lume pip | Standard Super-LumiNova applied to hour markers and hands. Green emission spectrum provides reliable low-light visibility. |
| Open-Heart Dial Engineering | — | Unlike standard open-heart designs that simply drill cutouts into solid dials, the RW1212 movement's gear train was completely relocated to position the balance wheel at 6 o'clock on the dial side, suspended symmetrically under a skeletonized single bridge. This is dedicated engineering, not cosmetic modification. |
Cost of Ownership Compared
The Raymond Weil Freelancer Open Heart saves you $638 over 5 years of ownership
Who Should Pick Which
Pick the Oris Aquis Date Calibre 400 if…
- Dive watch enthusiasts — 300m water resistance is proper dive spec
- Those who prioritize scratch resistance — sapphire crystal
- Dive watch collectors who appreciate proper ISO-rated tool watches
- Buyers who prefer a commanding wrist presence — 43mm case
Pick the Raymond Weil Freelancer Open Heart if…
- Enthusiasts who want a visible balance wheel / open-heart complication under $2,000
- Those who value independent, family-owned Swiss watchmaking over conglomerate brands
- Dress-sport watch seekers — the Freelancer bridges formal and casual effortlessly
- Buyers who appreciate genuine movement engineering (RW1212 is proprietary, not a cosmetic cutout)
- Music and arts enthusiasts drawn to Raymond Weil's cultural DNA
Oris Aquis Date Calibre 400
- Sellita base movement at this price — fair value but not in-house prestige (Caliber 400 variants resolve).
- 43.5mm large for smaller wrists (smaller variants available).
- Proprietary endlinks limit strap options.
Raymond Weil Freelancer Open Heart
- Brand recognition gap: Raymond Weil has limited recognition outside watch enthusiast circles. Most people won't recognize the brand — which matters if brand cachet drives your purchase decision.
- 38–41 hour power reserve: Below the 2026 standard of 60–80 hours. The dedicated two-hand design helps conserve power, but skip a day wearing it and you'll still need to reset.
- Open-heart polarization: Open-heart designs are divisive — enthusiasts either love the visible mechanism or consider it a gimmick. The RW1212's symmetrical single-bridge execution is among the most elegant implementations, but the opinion split persists.
- Grey-market erosion: Heavy discounts (35–40% off retail) suggest the MSRP is aspirational rather than market-clearing, which can undermine perceived value.
Our Verdict
Oris
Aquis Date Calibre 400
Choose the Oris Aquis Date Calibre 400 if you prioritize Oris In-House Manufacture engineering, Swiss Made craftsmanship, and 300m (30 ATM) water resistance. At $2,500–$5,000, it delivers Automatic Calibre 400 with 120 Hours (5 Days) power reserve.
Check Price on AmazonRaymond Weil
Freelancer Open Heart
Choose the Raymond Weil Freelancer Open Heart if you value Automatic (Sellita SW200 base) technology, Swiss Made heritage, and 42mm proportions. At $1,500–$2,500, the Automatic Caliber RW4200 with 38 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Oris Aquis Date Calibre 400 and Raymond Weil Freelancer Open Heart represent two distinct approaches to fine watchmaking — the Oris bringing Swiss Made tradition while Raymond Weil delivers Swiss Made engineering.
Frequently Asked Questions
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.