Oris Aquis Depth Gauge (ref. 01 733 7755 4154-Set RS) – The Trust-Fund Tool Watch
The Oris Aquis Depth Gauge is not your father’s dive watch. While the market is saturated with Submariner homages and ceramic-bezel clones, Oris decided to actually innovate. The result is a watch that measures depth using a physical capillary tube—a feature so rare that only a handful of brands (like the now-defunct Sinn EZM 1) have attempted it. For the young collector with a portfolio of Rolexes and a desire for something that actually does something, the Aquis Depth Gauge is a breath of fresh, salty air.
Brand History
Oris has been making mechanical watches since 1904 in Hölstein, Switzerland. They’ve never chased the luxury stratosphere; instead, they focus on robust, affordable tool watches. The Aquis line, launched in 2011, became their flagship diver, and the Depth Gauge variant (introduced around 2015) added a unique mechanical depth measurement feature that sets it apart from conventional dive watches. It’s a brand that knows its audience: people who actually use their watches, not just flip them.
Movement
Inside the 43.5mm stainless steel case beats the Oris Caliber 733, a modified Sellita SW200-1. It’s an automatic movement with 26 jewels, a 38-hour power reserve, and a frequency of 28,800 vph. It’s not COSC-certified, and it’s not in-house, but it’s reliable and easy to service. The rotor is decorated with Oris’s signature red, but don’t expect haute horlogerie finishing. This is a workhorse, and it does the job.
Specifications
- Case diameter: 43.5mm
- Case thickness: 14.5mm
- Lug-to-lug: 50mm
- Case material: Stainless steel
- Crystal: Sapphire with anti-reflective coating
- Water resistance: 300m (1000ft)
- Lume: Super-LumiNova on hands and indices
- Bracelet/strap: Rubber strap with folding clasp and diver’s extension
- Clasp type: Folding clasp with micro-adjust
Wrist Feel
The 43.5mm case wears larger than the diameter suggests due to the thick bezel and integrated lugs. On a rubber strap, it’s surprisingly comfortable—the strap is soft and flexible, and the watch sits flat on the wrist. At 14.5mm thick, it’s a chunky piece, but the weight is well-distributed. The depth gauge mechanism adds a slight asymmetry, but it doesn’t affect balance. For a 7-inch wrist, it’s borderline; smaller wrists may find it overwhelming. The rubber strap is the smart choice for daily wear—the bracelet version adds significant heft and is less comfortable.
Accuracy
The Oris 733 movement typically runs within -10 to +20 seconds per day out of the box, which is acceptable for a non-COSC movement. In real-world use, expect around +5 to +15 seconds per day depending on position and activity. It’s not a precision instrument, but for a dive tool watch, it’s adequate. If you need chronometer-level accuracy, look elsewhere.
Occasions
This is a sport watch through and through. It’s perfect for diving, swimming, or any water activity. It also works as a daily beater thanks to the comfortable rubber strap and robust construction. It’s not a dress watch—the thickness and size make it hard to slip under a cuff. But for travel, it’s a great companion: rugged, legible, and unique.
Wrist Presence: 4/5
The depth gauge window and oversized crown guards make it a statement piece. It’s not subtle, but it’s undeniably cool. The blue dial and ceramic bezel insert catch light beautifully, and the rubber strap keeps it from being too flashy. It will get noticed, especially by fellow watch nerds who know what the little window means.
Reference Variants
The reference 01 733 7755 4154-Set RS is the blue dial on rubber strap. There’s also a bracelet version (01 733 7755 4154-Set) and black dial (01 733 7755 4157-Set RS) and green dial (01 733 7755 4158-Set RS). The green dial is limited and commands a premium on the pre-owned market.
Family References
The Aquis Depth Gauge sits within the larger Aquis family, which includes the standard Aquis Date (ref. 01 733 7730 4135-Set) and the higher-end Aquis 400 with in-house movement (ref. 01 400 7763 4135-Set).
Other Notable Oris Models
Oris also produces the Big Crown ProPilot X (a modern aviation watch), the Divers Sixty-Five (a vintage-inspired diver), and the Aquis Caliber 400 (with a 5-day power reserve and 10-year warranty).
Similar Watches
In the same price bracket, the Seiko Prospex Marinemaster 300 (SLA043) offers similar build quality but no depth gauge. The Longines HydroConquest is a direct competitor with a more traditional dive watch design. The Doxa SUB 300T is another iconic dive watch with a unique bezel and strong collector appeal.
Homages
There are no direct homages to the depth gauge feature, but cheap dive watches like the Invicta Pro Diver (ref. 8926OB, ~$89) or Steeldive SD1970 (~$120) mimic the general dive watch aesthetic without the functionality.
Investment Value
MSRP is $2,500, current retail is around $2,600. Pre-owned prices range from $1,600 to $2,200. The trend is stable—not appreciating, but not crashing either. The depth gauge novelty keeps it from tanking, but don’t expect a return. Buy pre-owned to avoid the initial depreciation. Auction history is minimal; most sales happen on Chrono24 and eBay.
Service Interval
Oris recommends service every 5 years. Cost is approximately $400 at an authorized service center, but independent watchmakers can service the Sellita-based movement for less. No need for authorized-only service unless you want to maintain warranty.
Price Range & Verdict
The price range is $1,600–$2,600. For the trust-fund-baby buyer, the verdict is: fair value for a unique tool watch. Target pre-owned under $2,000 to maximize the fun-to-dollar ratio.
Pros and Cons
Pros: Genuinely functional depth gauge, robust 300m water resistance, comfortable rubber strap, reliable movement. Cons: Large case, movement lacks in-house prestige, depth gauge is a gimmick if you never dive, stable but not appreciating resale.
Final Verdict
The Oris Aquis Depth Gauge is a niche masterpiece for the collector who values function over hype. It’s not a Submariner killer, nor is it an investment piece. But for the trust-fund-baby who wants a watch that actually does something unique—and looks good doing it—this is a solid addition to the rotation. Buy pre-owned, wear it in the water, and enjoy the envy of your dive buddies.
