Tudor · July 31, 2026
Selling the Tudor Black Bay 58 79030N
The 39mm in-house Black Bay 58 in black — MT5402, the size that made it, and what separates a strong example from a weak one.
Market guide: This article explains valuation factors. It is not a customer testimonial, completed transaction, promise or appraisal.
The Black Bay 58, reference 79030N, is the watch that fixed the one complaint people had about the original Black Bay: size. When it launched in 2018 Tudor brought the case down to 39mm and slimmed the profile, and that decision is most of why the model became the modern Tudor everyone points to. The "58" is a nod to 1958, the year Tudor's first 200m diver appeared, and the 79030N is the black-dial, black-bezel version — the core of the line rather than a limited variant.
Inside is the Caliber MT5402, Tudor's in-house automatic, chronometer-certified by COSC and carrying a power reserve of around seventy hours. This is the fact that separates the Black Bay 58 from the earlier Black Bays that used modified ETA movements, and it matters to a buyer: an in-house, COSC-rated caliber with a long reserve is a more confident proposition than a sourced movement, and it supports the model's value on the secondary market.
For a seller, the first thing to establish is exactly which 79030 you have, because the reference is shared. The 79030N is black; the 79030B is the "Navy Blue" version, and there are related bronze, sterling and other Black Bay Fifty-Eight siblings under adjacent numbers. Demand differs between them, so getting the color and configuration right is not pedantry — it changes the audience and the number. A buyer will confirm it from the caseback and the dial before quoting.
The 79030N also carries the gilt design language that defines the Black Bay look: gilt-tone dial printing and hands, a domed sapphire crystal that nods to acrylic-era divers, and the red-triangle bezel on the black version. Those cosmetic details are original to the watch and a buyer expects them intact — a scratched-through bezel triangle or a swapped hand set detracts, because the vintage-faithful styling is a large part of why the model sells in the first place.
It also helps to distinguish the 79030N from the original 41mm Black Bay that preceded it. The earlier Black Bay is larger and, in its first years, used a modified sourced movement rather than the in-house MT5402. Sellers sometimes describe one as the other, and because the 39mm in-house 58 is the more sought-after configuration, a buyer will confirm the case size and the movement from the caseback before quoting a number.
The bracelet situation is where Black Bay sellers lose the most, and it is worth stressing. Tudor sold the 79030N on a folded-link steel bracelet, on a riveted-style bracelet, and on straps, and the watches move between them constantly. A 79030N on an aftermarket strap with the original bracelet missing loses real value, because the bracelet is expensive to buy separately and a bracelet-complete watch is simply easier to resell. Before you submit photos, dig out whatever original strap and bracelet came with it.
Completeness beyond the bracelet follows current-model logic, because this is a recent watch. The box, the warranty card stamped and dated by an authorized dealer, the hang tags and any extra links all speed verification and lift the offer toward the top of a range. A watch-only 79030N is still very buyable — the model is liquid — but the missing card removes a shortcut, and on a watch this popular, easy verification has value.
Condition review is quick but it is not nothing. The Black Bay 58 mixes brushed and polished surfaces on the case and lugs, and a heavy polish that softens those edges reads as damage to anyone who knows the model. The aluminum bezel insert can take knocks; a clean, unfaded insert is worth more than a chipped one. Snowflake hand and dial should be unmarked, and the crown should screw down cleanly. Honest desk wear is expected and forgiven — buffing meant to hide it is not.
Service risk is low on a watch this young, but a buyer still prices for it. If the MT5402 runs within a reasonable daily rate, winds and sets normally and holds its power reserve, there is little to reserve for. If it has sat unworn for a long time or is running noticeably off, eventual service gets factored in. A recent service with paperwork removes the question, though many 79030N examples are simply too new to need one yet.
So a direct offer on a 79030N comes from confirming it is the black version, checking that the original bracelet is present, grading the case, bezel and dial, and verifying the movement runs correctly. A sharp, boxed, bracelet-complete example earns the top of its planning range; a worn, strap-only, watch-only piece earns a fair lower number, and we explain the difference rather than fold it into one figure. Because the Black Bay 58 holds its value well, that gap between a strong and a weak example can be surprisingly wide for a modern watch.
If you want to see the 79030N alongside the other Black Bays and Tudor divers we buy, the Black Bay page covers the family, and a few clear photos of the caseback, dial, bezel and clasp — plus a note on which bracelet and box you still have — are enough for us to give you a provisional number before anyone meets in person. Because the 58 is one of the most liquid modern Tudors, a clean, complete example tends to move quickly, and a direct offer trades a little money for the speed and certainty that consignment on a watch in this tier rarely matches.