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Silver Treasure: Testing the Tudor Black Bay Fifty Eight 925


Silver Treasure: Testing the Tudor Black Bay Fifty Eight 925


Tudor has brought silver back onto the scene with its Black Bay Fifty Eight 925. How good is this watch with the striking taupe dial? We find out in this in-depth, hands-on review.

Tudor Black Bay Fifty Eight 925 (Ref. M79010SG-0001)

Tudor is one of the few brands whose desirability has increased significantly in recent years. This is mainly due to the attractiveness of its models, most certainly including the Black Bay and the smaller version, the Black Bay Fifty-Eight, launched in 2018. The version we tested here came on the market in 2021 in a silver case with a taupe-colored dial and bezel.

The name Fifty-Eight refers to 1958, the year in which Tudor introduced its first dive watch. French Navy divers turned to the brand to develop an ideal dive watch, designed especially for their needs, and Tudor consequently became the outfitter for French combat divers. The 39-mm case size is the same as its historical predecessor. The rotating bezel and smaller dial give the watch an understated look that is in line with current trends.

The vintage appearance is heightened by a domed, scratch-resistant sapphire crystal, which replaces the original acrylic glass. The dial also has a slight retro-style curve. The narrow lugs and the typography on the rotating bezel also cite Tudor’s history. Even the date was omitted for a more historically accurate impression. The traditional “snowflake” hands have been in use at Tudor since the late 1960s.

In contrast to previous models, the Black Bay Fifty-Eight 925 that was introduced in 2021 has a taupe-colored bezel and dial. The color, which could also be viewed as a faded black, goes well with the vintage design. While on the other hand, the gray-brown tone is also a modern trend color, especially in current interior design.

A new crystal caseback offers a look at the accurate, well-built Caliber MT5400.

A Secret Silver Alloy
The taupe color harmonizes well with the warm tones of the 925 silver case. The designation “925” means the case is made of 92.5 percent silver and 7.5 percent other materials. Conventional sterling silver also contains this amount of pure silver with the rest being primarily copper, which gives the metal a reddish hue. However, sterling silver has a tendency to tarnish, as anyone owning sterling silver flatware can attest to. It is the result of a chemical reaction between the silver and sulfur-containing substances in the air, darkening the silver over time. To prevent this, Tudor has used a different alloy that is touted as being non-tarnishing. Although Tudor has not revealed the other materials, there are known alloys containing palladium and germanium that prevent tarnishing and can even be hardened. This material’s hardness is still more comparable to gold than to steel. The Tudor case shines with a bright luster and is warmer in color than stainless steel or platinum.

While the aluminum scale on the diving bezel is not as resistant to scratches as a ceramic alternative, its matte surface goes better with the watch’s vintage look. All in all, our test watch impresses, with an attractive design and very harmonious colors.

Happily, functionality did not fall victim to design here. Large luminous markers and a generous application of luminous material on the hands provide excellent legibility both day and night. The screw-down crown is easy to grasp; it decouples itself from the winding mechanism to reduce wear. The inclusion of a hack mechanism, plus no date display and no pulled-out crown position for that function, make time setting simple. The unidirectional rotating bezel ratchets in one-minute increments and is easy to grasp and turn thanks to its coined edge. Its clicking operation feels almost as rich as that of a Rolex timepiece. A luminous marker shows dive time, even in the dark. Thanks to the case, which is waterproof to a depth of 200 meters, the Black Bay is truly suitable for diving, at least when you wear the NATO textile strap.

The 39-mm size is especially flattering on a slim wrist.

Strap Options
Our test watch came with an attractively textured dark-brown leather strap with contrast stitching and a rubber lining, which extends the life of the strap. A very well-constructed, practical pin buckle is made of brushed silver, which matches the case. Visually, we liked the taupe textile strap with a silver central stripe better than the leather strap because it doesn’t taper toward the buckle as much. However, the textile strap obscures the caseback, which is especially unfortunate here since this is the first Black Bay model in regular production with a transparent window that permits a view of automatic Caliber MT5400. The caliber is produced by the movement manufacturer Kenissi, which is also a supplier to Chanel, Breitling, Fortis, and other watch brands.

The price of the watch with a silver case is only moderately higher than that of the steel-cased version.

A Robust Caliber
The movement boasts both sturdiness and precision. Its considerable height of 4.99 mm makes it robust to avoid functional disturbances, even in the case of the smallest tolerance fluctuations that may have occurred in production. In addition, the balance is secured by a full bridge rather than on just one side. The silicon hairspring maintains centricity, as it is resistant to deformation caused by impact or other disturbances. Other high-quality features of this in-house movement include the extended 70-hour power reserve and free-sprung balance wheel with four regulating screws — so the rate is not adjusted by changing the active length of the hairspring, as is usually the case with most ETA calibers. Decorations to the movement are modest but the rotor is skeletonized and has a sunburst finish and a Tudor engraving.

Rate precision is certified by COSC, the Official Swiss Chronometer Testing Institute, where Tudor sends a majority of its movements to be checked (the MT5602-1U used in the new Black Bay Ceramic comes with a Master Chronometer certificate from METAS). In addition to other criteria, the rate results are guaranteed to remain within a range of -4 and +6 seconds per day. Results shown on the electronic timing machine confirm this level of accuracy: the values in different positions remain quite close, while the average deviation was almost perfect: only +1 second per day. On the wrist, we saw a gain of 2 seconds per day, which was likely due to the fact that the watch was placed “dial-up” overnight, the position that showed the greatest gain of +5 seconds.

The technical features of the Tudor Black Bay Fifty-Eight 925 put it on the cutting edge, and its execution and finishing make it a standout. The design mix of retro elements and warm gray tones knows how to inspire, and the additional cost of $950 above the base price for the silver version feels moderate and appropriate.

The optional textile strap looks great but hides the movement.

Manufacturer: Tudor, Rue François-Dussaud 3-5, 1211 Geneva 26, Switzerland
Reference number: M79010SG-0001
Functions: Hours, minutes, seconds
Movement: Caliber MT5400, automatic, COSC-certified chronometer, 28,800 vph, 27 jewels, stop- seconds mechanism, silicon hairspring, free-sprung balance with four regulating screws, Incabloc shock absorber, 70-hour power reserve, diameter = 26 mm, height = 4.99 mm
Case: 925 silver, domed sapphire crystal with anti-reflective coating on both sides, screw-down crown, threaded caseback with sapphire crystal viewing window; water resistant to 200 meters
Strap and clasp: Calfskin strap with rubber lining and silver pin buckle
Rate results (deviations in seconds per 24 hours):
Dial up +5
Dial down +1
Crown up +1
Crown down −1
Crown left −1
Crown right +1
Greatest deviation 6
Average deviation +1
Average amplitude:
Flat positions 291°
Hanging positions 255°
Dimensions: Diameter = 39 mm, height = 12 mm, weight = 90 grams
Variations: With textile strap (Ref. M79010SG-0002, $4,300)
Price: $4,300

Strap and clasp (max. 10 points): The calfskin strap with rubber lining is well made, as is the practical silver pin buckle. 8
Case (10): Excellent finishing of the case made of a special silver alloy 8
Dial and hands (10): Domed dial, applied markers and cleanly polished hands give the watch a high-quality overall impression. 9
Design (15): An attractive retro design with well-matched warm gray tones 14
Legibility (5): The generous application of luminous material on the displays and the high contrast between the hands and the dial make for excellent legibility, both day and night. 5
Operation (5): The screw-down crown is easy to use, a stop-seconds mechanism facilitates accurate time setting, and the grooved rotating bezel turns easily. 5
Wearing comfort (5): The watch sits comfortably on the wrist with a supple leather strap 5
Movement (20): The movement is robustly constructed and has a long power reserve. Decorations are modest. 15
Rate results (10): Low average deviation and no excessively high beat error in the various positions. 8
Overall value (10): Moderate additional cost for a silver case at an appropriate price; good overall value 8
Total: 85 POINTS

This article originally appeared in the September-October 2021 issue of WatchTime.