Tudor Black Bay 58 vs Junghans Form A Automatic
Tudor's diver meets Junghans's dress watch
Quick Verdict
The Junghans Form A Automatic ($1,000–$1,500) delivers Swiss ETA Base, German-Finished technology in the tier below the Tudor Black Bay 58 ($2,500–$5,000). The Form A Automatic measures 39.3mm and is rated 50m (5 ATM). The Black Bay 58 justifies its premium with Swiss Made heritage and Automatic Manufacture Calibre MT5402. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Tudor Black Bay 58 | Junghans Form A Automatic |
|---|---|---|
| Price | $2,500–$5,000 | $1,000–$1,500 |
| Case Size | 39mm | 39.3mm |
| Movement | Automatic Manufacture Calibre MT5402 | Automatic J800.2 (ETA 2824-2) |
| Caliber Type | In-House Automatic Manufacture (Kenissi) | Swiss ETA Base, German-Finished |
| Power Reserve | 70 Hours | 38 Hours |
| Water Resistance | 200m (20 ATM) | 50m (5 ATM) |
| Crystal | Domed Sapphire | Flat Sapphire with Anti-Reflective Coating |
| Case Material | 316L Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Made in Germany |
Category-by-Category Analysis
Design & Aesthetics
Tudor's design language vs Junghans's approach
The Tudor Black Bay 58 features a 316L Stainless Steel case at 39mm with Domed Sapphire protection. The Junghans Form A Automatic offers Stainless Steel construction at 39.3mm with Flat Sapphire with Anti-Reflective Coating. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Manufacture Calibre MT5402 vs Automatic J800.2 (ETA 2824-2)
The Black Bay 58 runs the Automatic Manufacture Calibre MT5402 (In-House Automatic Manufacture (Kenissi), 70 Hours power reserve) at 28,800 vph (4 Hz) frequency. The Form A Automatic uses the Automatic J800.2 (ETA 2824-2) (Swiss ETA Base, German-Finished, 38 Hours reserve) at 28,800 vph (4 Hz). The Black Bay 58 edges ahead on power reserve.
Wearability & Fit
39mm vs 39.3mm — different wrist presence
At 39mm, the Black Bay 58 wears more compactly on smaller wrists compared to the Form A Automatic at 39.3mm. Water resistance differs: 200m (20 ATM) vs 50m (5 ATM).
Value & Cost of Ownership
Junghans sits in the lower tier
The Tudor Black Bay 58 sits at $2,500–$5,000 and the Junghans Form A Automatic at $1,000–$1,500. On the specs that outlast any price: the Black Bay 58 uses Domed Sapphire with 70 Hours, against Flat Sapphire with Anti-Reflective Coating and 38 Hours on the Form A Automatic. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 50m (5 ATM)
The Black Bay 58 is rated to 200m (20 ATM) while the Form A Automatic handles 50m (5 ATM). The Black Bay 58 is better suited for water activities.
Materials Face-Off
| Component | Tudor Black Bay 58 | Junghans Form A Automatic |
|---|---|---|
| In-House MT5402 Caliber | Fully in-house manufacture at Kenissi (Le Locle). 26mm × 4.99mm, 27 jewels, free-sprung balance with variable inertia regulation | 316L stainless steel — standard grade for mid-range watchmaking. Hypoallergenic, corrosion-resistant. |
| Silicon Balance Spring | Si hairspring providing antimagnetic protection and superior isochronism | Flat sapphire (Mohs 9) with anti-reflective coating on the underside — provides excellent clarity with minimal internal glare. Note — Unlike the Max Mohs 9 |
| Domed Sapphire Crystal | Synthetic corundum (Al₂O₃) grown via Verneuil process, anti-reflective coating on inner surface Mohs 9 | Tinted mineral glass (smoke/grey tint) — provides partial view of the movement while maintaining a subtle aesthetic. |
| Anodized Aluminum Bezel | Anodized aluminum insert with engraved 60-minute dive scale — deliberately not ceramic | Brass-base dial with matte silver lacquer finish, embossed (stamped) square minute track producing three-dimensional relief. |
| 316L Stainless Steel | Medical-grade 316L (Cr 16–18%, Ni 10–14%, Mo 2–3%). Satin-brushed tops, polished bevels | Black calfskin leather with polished stainless steel pin buckle. Leather is adequate quality but not luxury-grade. |
Cost of Ownership Compared
The Junghans Form A Automatic saves you $2,337 over 5 years of ownership
Who Should Pick Which
Pick the Tudor Black Bay 58 if…
- True in-house COSC-certified manufacture movement at sub-$4,000
- 39mm "perfect proportions" — fits virtually any wrist from 6" to 8"
- Heritage collectors — direct lineage to the 1958 Tudor Submariner Reference 7924
- Wilsdorf Foundation (Rolex sister) pedigree without the waitlist or pricing
- 10-year service interval — longest in Swiss watchmaking, an explicit confidence statement
Pick the Junghans Form A Automatic if…
- Enthusiasts wanting proven Swiss/Japanese quality in the $1,000–$2,000 sweet spot
- Those who prioritize scratch resistance — sapphire crystal
- Dress watch seekers who want understated elegance
Tudor Black Bay 58
- No date complication — a feature for purists, but a limitation for daily-wearer buyers who want at-a-glance date
- 316L not 904L — Tudor uses standard steel, not Rolex's "Oystersteel" (practically irrelevant for the wearer)
- Aluminum bezel insert scratches more easily than ceramic — heritage-correct, but less daily-wear robust
- Bracelet endlinks are proprietary — limits aftermarket bracelet options (straps still work via drilled lug holes)
Junghans Form A Automatic
- ETA 2824-2 at a $1,000–$1,500 band price — fair value but not prestige movement. NOMOS offers in-house for only slightly more.
- 38-hour power reserve — leaves unworn for a weekend and it's stopped by Monday
- No lume / dress-only — not versatile for active or outdoor use
- Limited US distribution — difficult to try on in person outside major cities
Our Verdict
Tudor
Black Bay 58
Choose the Tudor Black Bay 58 if you prioritize In-House Automatic Manufacture (Kenissi) engineering, Swiss Made craftsmanship, and 200m (20 ATM) water resistance. At $2,500–$5,000, it delivers Automatic Manufacture Calibre MT5402 with 70 Hours power reserve.
Check Price on AmazonJunghans
Form A Automatic
Choose the Junghans Form A Automatic if you value Swiss ETA Base, German-Finished technology, Made in Germany heritage, and 39.3mm proportions. At $1,000–$1,500, the Automatic J800.2 (ETA 2824-2) with 38 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Tudor Black Bay 58 and Junghans Form A Automatic represent two distinct approaches to fine watchmaking — the Tudor bringing Swiss Made tradition while Junghans delivers Made in Germany engineering.
Frequently Asked Questions
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Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.