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The Brellum Pandial Power Reserve LE is a 43 mm automatic COSC-certified chronograph with a date and a power-reserve display. Its stated reserve is 46 hours. The closest comparison here is the 41 mm TUDOR Black Bay Chrono: it has a COSC-certified automatic chronograph, about 70 hours of reserve and 200 m water resistance, but no listed power-reserve display. The Brellum listing specifies 100 m water resistance. These are manufacturer specifications, not results from independent comparative testing.
What the Brellum Pandial Power Reserve offers
Brellum’s steel Pandial Power Reserve LE, SKU DB.CH.944, combines a 12-hour chronograph with a power-reserve indicator, date, stop seconds, tachymeter and telemeter scales. Its automatic BR-750RM is described by Brellum as Valjoux-based and COSC-certified; the watch is delivered with a certificate. The manufacturer lists 25 jewels, a frequency of 28,800 A/h and 46 hours of reserve. Brellum’s product listing is the source for these specifications.
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Steel edition dimensions and construction
The steel case is 43 mm in diameter and 316L stainless steel, with listed water resistance of 100 m. Brellum gives a thickness of 15.90 mm including the domed crystals and 10.90 mm excluding them. The watch has a box-shaped sapphire crystal, an exhibition back and a decorated movement. The listing includes a steel bracelet and calf leather strap.
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Brellum also lists the black titanium Pandial Power Reserve LE, SKU DB.CH.945, with a stated edition limit of 23 pieces. It retains the BR-750RM, COSC certificate, 46-hour reserve, 43 mm diameter, 100 m water resistance and core functions, but uses a Grade 5 black DLC titanium case, a Nebur Tec strap and a black titanium deployment buckle. See the black titanium product listing for its specifications.
#1 Best Overall
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How it compares with other COSC-certified mechanical watches
COSC certification is shared by watches with quite different sizes and purposes. The TUDOR is the more relevant comparison because it is also an automatic chronograph; the Longines Record illustrates the wider range of COSC-certified mechanical watches rather than matching the Brellum’s functions.
| Watch and cited reference | Movement and certification | Stated power reserve | Case and water resistance | Useful distinction |
|---|---|---|---|---|
| Brellum Pandial Power Reserve LE, steel, DB.CH.944 | BR-750RM, Valjoux-based automatic chronograph; COSC | 46 hours | 43 mm; 100 m | Power-reserve display, date, 12-hour chronograph, tachymeter and telemeter scales |
| TUDOR Black Bay Chrono M79360N-0012 | Manufacture Calibre MT5813, COSC automatic chronograph | About 70 hours | 41 mm; 200 m | Date at 6 o’clock, tachymeter bezel and 22 mm lug width on this reference; five-link bracelet |
| Longines Record L2.320.5.89.7 | Self-winding mechanical movement; COSC | Up to 45 hours | 26 mm; 3 bar | Three-hand/date watch, not a chronograph or a close size match |
The figures in the table come from the manufacturers’ listings: Brellum, TUDOR and Longines. They are product-page specifications, not an independent test. TUDOR’s cited page lists a US price of $6,875 for reference M79360N-0012; prices and availability can change.
Rank #2
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- 【Premium Materials & Everyday Durability】Built with a stainless steel case and bracelet, scratch-resistant sapphire crystal, and 3 ATM water resistance. Designed for daily wear while maintaining a polished, luxury appearance.
- 【Comfort Fit & Versatile Style】Adjustable stainless steel bracelet fits wrist sizes from 14-19 cm, secured with a folding clasp. A versatile dress watch for men and women, suitable for business, formal occasions, or elevated daily wear. (includes a precision screwdriver for adjusting the watch strap.)
The practical trade-off with the TUDOR
The Brellum’s distinct advantage in this comparison is its dedicated reserve indicator alongside the chronograph. The TUDOR lists a longer reserve, a smaller diameter and twice the stated water-resistance depth. Those differences may matter more than the shared certification: choose by the functions, dimensions and water-resistance rating you will actually use, rather than treating COSC as a complete ranking of the watches.
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Why the Longines is a different kind of comparison
The Longines Record listing describes a 26 mm three-hand/date watch with up to 45 hours of reserve and 3 bar water resistance. It demonstrates that COSC-certified mechanical watches vary widely in scale and function; it is not a like-for-like alternative to a 43 mm chronograph.
Rank #3
- 【Iconic Octagonal Design】Distinctive eight-sided case inspired by vintage mid-century watchmaking and architectural geometry. A refined alternative to traditional round watches, offering a bold yet balanced presence on the wrist.
- 【Natural-Inspired Dials with Enamel Bezel】Crafted with a detailed malachite green marble or wood grain dial, paired with an enamel bezel and Roman numeral markers. Each piece blends organic texture with classic elegance.
- 【Lab-Grown Diamond Accents (0.03 ct.)】Set with D–F color, VVS–VS clarity lab-grown diamonds for a subtle touch of brilliance. Ethically sourced and designed to enhance sophistication without overpowering the dial.
- 【Premium Materials & Everyday Durability】Built with a stainless steel case and bracelet, scratch-resistant sapphire crystal, and 3 ATM water resistance. Designed for daily wear while maintaining a polished, luxury appearance. (Includes a precision screwdriver for quick, easy sizing.)
- 【Comfort Fit & Versatile Style】Adjustable stainless steel bracelet fits wrist sizes from 14-19 cm, secured with a folding clasp. A versatile dress watch for men and women, suitable for business, formal occasions, or elevated daily wear. (includes a precision screwdriver for adjusting the watch strap.)
What COSC certification tells you—and what it does not
COSC status is relevant evidence about a movement’s chronometer certification, but it does not establish that two finished watches will perform identically on the wrist. TUDOR’s 2026 Black Bay Chrono 39 press material describes COSC’s average daily-rate allowance for an uncased movement as between -4 and +6 seconds per day. In the same document, TUDOR says its own standard for fully assembled watches with Manufacture Calibres is -2 to +4 seconds per day. That is TUDOR’s brand-specific standard, not a rule that applies to every COSC-certified watch. Read TUDOR’s 2026 press material.
The figures above should not be read as a head-to-head accuracy result for the Brellum and TUDOR. The cited specifications do not establish comparative wrist accuracy, reliability, long-term durability or service cost.
Rank #4
- 3 Hand, Automatic, Hack Feature, 42 Hour Power Reserve
- Domed Sapphire Crystal
- Gold-Tone Stainless Steel Case
- 30M Water Resistant
Prices, editions and availability
Brellum’s steel listing identifies a 33-piece worldwide limit and displays CHF 3,124.09; its narrative rounds the price to CHF 3,125 and gives an export price of CHF 2,890. The page also states an October 31, 2025 release date and November 2025 shipping. Its black titanium listing displays CHF 3,232.19, with narrative pricing of CHF 3,235 and an export price of CHF 2,990. These are figures and edition details stated on the brand’s listings, not independently verified rarity or guaranteed transaction prices. Check the live listings and confirm availability and applicable price with Brellum before buying. The TUDOR page’s displayed US price is specific to the cited reference and market.
Quick Recap
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- ELEGANT DESIGN: Rectangular gold-tone case with a clean white dial face featuring minimalist hour markers and hands for a sophisticated look
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- PREMIUM CONSTRUCTION: Crafted with durable stainless steel band and case, equipped with 3ATM waterproof function, finished in luxurious gold&silver tone for lasting beauty, meet daily usage needs
- RELIABLE TIMEKEEPING: Powered by precise Japanese quartz movement ensuring accurate time-keeping and minimal maintenance
- DIMENSIONS: Dial length 1.1in, dial width 0.9in, case thickness 0.35in, band length 7.67in, and band width 0.55in for a sleek, refined profile.
How to choose between them
- Choose around the complications: the Brellum lists a power-reserve display as well as a chronograph and date; the cited TUDOR lists a chronograph and date without a reserve display.
- Check the dimensions on your wrist: the steel Brellum is 43 mm, while the cited TUDOR is 41 mm. Diameter alone does not describe how a watch wears, so consider the full case shape and thickness; Brellum lists its thickness both with and without the domed crystals.
- Match water resistance to use: the listings state 100 m for the Brellum and 200 m for the TUDOR. These ratings are specifications, not a substitute for following the manufacturer’s guidance on use and maintenance.
- Decide whether the material and strap configuration suit you: Brellum’s steel listing includes a bracelet and calf leather strap; its separate black DLC titanium edition uses a Nebur Tec strap.
- Verify ownership support directly: the specifications cited here do not establish warranty terms, servicing networks, resale value or service costs. Confirm those details for your location before purchase.
- Confirm live commercial details: displayed prices, stock and limited-edition availability can change; treat edition counts as brand-stated figures rather than independent rarity assessments.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
