Name: Tudor Heritage Black Bay Bronze 79250BM
Brand: Tudor
SKU: 79250BM

The Black Bay Bronze asks you to accept a watch that will look different in six months than it does on day one. Bronze oxidizes at contact points, softening the lug edges and deepening the case color over time. If that sounds like a feature rather than a flaw, this watch was made for you.

What it is

Tudor introduced the Heritage Black Bay Bronze in 2016, and it arrived at a moment when bronze was still genuinely unusual in production dive watches. Most manufacturers using the alloy kept it in limited quantities or boutique runs. Tudor put it into regular production with the full Black Bay treatment: domed crystal, snowflake handset, screw-down crown, 200m water resistance.

The MT5601 movement inside was Tudor's first in-house caliber, developed in partnership with Rolex Group resources. That combination of a serious material story and credible in-house movement gave the reference a leg up on competitors doing bronze as decoration.

Buying notes

Bronze is the main decision point and it is irreversible. The patina develops whether you want it to or not, and it develops unevenly, which is the point. Buyers who purchase this watch hoping to keep it pristine will be fighting the material.

The 43mm case with its 14.8mm height reads large on smaller wrists, and the fabric strap does not dress it down as much as photos suggest. The aluminum bezel insert scratches easily and does not share the aging story of the case, so it can start to look mismatched after a few years of wear. Pre-owned examples vary widely in patina: some buyers prize a heavily developed case, others want one that is still early in its evolution, so inspect condition photos carefully before buying remotely.

Market read

The Bronze has held its value steadily without the volatility that hit steel Black Bays during the grey market peak years. Retail is roughly $4,000 to $4,200 depending on configuration. Pre-owned examples in good condition trade at or slightly below retail, which is healthy for a production watch.

Heavily patinated examples with original box and papers carry a premium in some collector circles, which is unusual for a Tudor.

Service expectations

The MT5601 is a Tudor manufacture caliber with a 70-hour power reserve and a free-sprung balance. Tudor recommends service intervals of approximately 7 to 10 years under normal wear conditions. The bronze case requires no special service treatment, but polishing should be avoided entirely since it strips the patina and cannot be authentically restored.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

Bronze case patinas uniquely per owner and commands secondary premiums that original list price alone does not explain.

Mass-producedsleeper#6 in family

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Movement tier: unclassified · caliber Tudor MT5601: in-house automatic, 28,800bph, 70h PR, 26j; COSC-certified, free-sprung balance; used in Black Bay Bronze 43mm · 70h power reserve (2.9 days)

Large case: suits wrists 7 in+ (18 cm+)

43 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

Bronze patina is a feature, not a flaw; a heavily polished Bronze BB has lost its intended surface character.

Known issues in the market

Aggressive polishing removes the natural bronze toning; a uniformly bright gold-like surface is not the intended aesthetic.
Cal. MT5601 is METAS-certified in-house; service at non-Tudor facilities may void METAS status.
The bronze alloy Tudor uses is non-allergenic by design; a rash or reaction indicates a non-Tudor alloy case.

Area	What to check	What is correct	Red flag
case	Bronze patina and tonal variation	Warm brown toning with variation across case surfaces consistent with the watch age; not uniformly bright	Uniformly bright gold-like surface indicating polishing that removed the natural patina
caseback	Cal. MT5601 in-house movement	Tudor Cal. MT5601 visible through caseback; movement signed Tudor and METAS-certified	Non-Tudor ETA movement visible indicating a movement swap
case	Bronze alloy color and texture	Distinctive warm copper-brown hue of Tudor bronze alloy; matte to satin surface between wear facets	Yellow-gold color suggesting brass rather than Tudor bronze alloy

Common legitimate replacements

Cal. MT5601 service must go through Tudor or authorized centers to maintain METAS certification.
Bronze case polishing is irreversible in the traditional sense; once polished bright the patina must re-develop over years of wear.

Expert resources: Tudor Heritage Black Bay Bronze documentation at tudorwatch.com. WatchUSeek Tudor subforum for bronze alloy identification and patina assessment.

Authentication guide

Last reviewed June 2026

The Black Bay Bronze is Tudor's bronze-case dive watch. The bronze alloy develops a golden-brown patina over time; this patina is a feature, not a flaw. The caseback is titanium (not bronze) to prevent skin contact with the copper in the bronze alloy. Authentication priorities are the bronze case material, the titanium caseback contrast, and the MT5601 movement.

Known reproduction risks

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HIGH RISK

Steel cases with bronze plating presented as genuine bronze construction.

Case that attracts a magnet -- genuine bronze is non-magnetic; steel fakes will attract a magnet
Caseback with the same patina as the case -- genuine titanium caseback does not patina
Patina that appears applied (uniform, artificial-looking) rather than developed naturally through oxidation and handling
Snowflake hands with wrong proportions for the 43mm case size

Dial variants by era

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Era	Description	Identifiers
2016 to present (brown dial)	Brown dial complementing the bronze case. The combination of warm brown dial, bronze case patina, and fabric strap gives the Black Bay Bronze a distinctive explorer aesthetic.	Brown matte dial with snowflake hands in Tudor's house profile Bronze case with visible patina on older examples; newer examples show bright bronze that will develop patina over time Aluminum bezel insert (brown or black depending on variant) Fabric or leather strap standard on this reference 43mm case -- larger than the BB41 and significantly larger than the BB58
2016 to present (blue dial)	Blue dial variant. Same bronze case and MT5601 movement.	Blue dial with snowflake hands in consistent proportion to the 43mm case Bronze case patina developing at the same rate regardless of dial color

Service part flags

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Bronze case and titanium caseback

Original: The case midband, lugs, bezel ring, and crown are bronze. The caseback is titanium. The bronze develops a golden-brown patina; the titanium caseback does not patina. This contrast between the patinated bronze case and the clean titanium caseback is a reliable verification point.

Replacement tells

Caseback that has developed the same patina as the case -- a bronze caseback is not correct for this reference; it should be titanium and remain patina-free
Case with no patina at all on an older example that has been worn -- older Bronze examples should show some development; a completely unpatinated case on a 3-plus year old watch warrants further investigation
Case that attracts a magnet -- bronze is non-magnetic; a magnetic case indicates steel or another material
Caseback that attracts a magnet -- titanium is non-magnetic

MT5601 movement

Original: Tudor MT5601 is an in-house automatic, 28,800bph, 70-hour power reserve. METAS-certified. Same caliber family as the MT5602 but without the bidirectional GMT function.

Replacement tells

Power reserve depleting in under 48 hours from full wind
Crown advancing a GMT hand -- the BB Bronze has no GMT complication
Caseback markings without METAS certification reference

Snowflake hands (43mm scale)

Original: Snowflake hands in the correct proportion for the 43mm case. They are wider and longer than the BB58 925 hands. The lume plots are larger to maintain legibility at 43mm.

Replacement tells

Hands with wrong proportions for the 43mm case -- BB58 hands fitted to the BB Bronze case would appear too small
Round lume plots rather than rectangular snowflake-style plots

Case back markings

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2016 to present

Titanium solid caseback (contrasting finish from the bronze case) with Tudor shield at center
"TUDOR BLACK BAY BRONZE" on the outer ring
"MANUFACTURE MOVEMENT" and METAS reference
"200M / 660FT" water resistance rating
Reference 79250BM and serial number on the case

Movement tells

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MT5601, 28,800bph, 70-hour power reserve. Fully wound watch should run 65 to 70 hours.
METAS-certified: rate accuracy across multiple positions should be tightly controlled.
Silicon hairspring: rate should not change near a magnet.
No GMT complication: crown at position 1 does not advance a separate hand.

Sources: Tudor -- Black Bay Bronze specification.