Omega
Seamaster 300m
Ref. 210.30.42.20.01.001
$6k–$6k
Pre-owned: $5k–$6k
Omega Seamaster 300mvsTudor Black Bay GMT
Complete head-to-head comparison
Featured ComparisonComparing the Omega Seamaster 300m ($6k–$6k, 300m WR, 42mm) against the Tudor Black Bay GMT ($4k–$5k, 200m WR, 41mm). The Tudor Black Bay GMT is the more affordable option by $2k.
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Tudor
Black Bay GMT
Ref. M79830RB
$4k–$5k
Pre-owned: $4k–$4k
Price
Seamaster 300m$6k–$6k
Black Bay GMT$4k–$5k
Water Resistance
Seamaster 300m300m
Black Bay GMT200m
Score
Seamaster 300m8/10
Black Bay GMT8/10
Repurchase
Seamaster 300m80%
Black Bay GMT80%
Specifications Compared
Spec
Omega Seamaster 300m
Tudor Black Bay GMT
Seamaster 300m
Black Bay GMT
Case Diameter
42mm
41mm
Case Diameter
Seamaster 300m
42mm
Black Bay GMT
41mm
Case Thickness
13.6mm
14.6mm
Case Thickness
Seamaster 300m
13.6mm
Black Bay GMT
14.6mm
Lug Width
21mm
20mm
Lug Width
Seamaster 300m
21mm
Black Bay GMT
20mm
Lug-to-Lug
51mm
50mm
Lug-to-Lug
Seamaster 300m
51mm
Black Bay GMT
50mm
Movement
automatic
automatic
Movement
Seamaster 300m
automatic
Black Bay GMT
automatic
Caliber
Cal. 8800
MT5652
Caliber
Seamaster 300m
Cal. 8800
Black Bay GMT
MT5652
Power Reserve
55h
70h
Power Reserve
Seamaster 300m
55h
Black Bay GMT
70h
Water Resistance
300m
200m
Water Resistance
Seamaster 300m
300m
Black Bay GMT
200m
Crystal
sapphire
sapphire
Crystal
Seamaster 300m
sapphire
Black Bay GMT
sapphire
Case Material
Stainless Steel
Stainless Steel
Case Material
Seamaster 300m
Stainless Steel
Black Bay GMT
Stainless Steel
Bracelet/Strap
Stainless Steel
Stainless Steel Integrated
Bracelet/Strap
Seamaster 300m
Stainless Steel
Black Bay GMT
Stainless Steel Integrated
Price (New)
$6k–$6k
$4k–$5k
Price (New)
Seamaster 300m
$6k–$6k
Black Bay GMT
$4k–$5k
Price (Pre-owned)
$5k–$6k
$4k–$4k
Price (Pre-owned)
Seamaster 300m
$5k–$6k
Black Bay GMT
$4k–$4k
Style
dive, sport
gmt, sport, dive
Style
Seamaster 300m
dive, sport
Black Bay GMT
gmt, sport, dive
Pros & Cons
Omega Seamaster 300m
Pros
- ✓Ceramic dial and bezel combination looks stunning in person
- ✓METAS-certified — excellent accuracy and magnetism resistance
- ✓Wave-pattern dial photographs beautifully and starts conversations
- ✓Helium escape valve adds genuine tool-watch credibility
Cons
- ✗42mm wears larger than expected due to thick case
- ✗Bracelet clasp lacks micro-adjust of Rolex and Tudor
- ✗Some find the wave dial too busy for daily wear
Tudor Black Bay GMT
Pros
- ✓One of the most affordable true GMT movements on the market
- ✓Pepsi bezel is a head-turner that gets constant compliments
- ✓Satin-brushed finishing punches well above its price
- ✓Snowflake hands give it a distinctive identity
Cons
- ✗14.6mm thickness makes it wear chunkier than expected
- ✗GMT hand color could be more visible
- ✗Rivet-style bracelet polarizes — many swap to NATO
Community Verdict
Too Close to Call
Both sit in a similar price range: Omega Seamaster 300m at $6k–$6k vs Tudor Black Bay GMT at $4k–$5k — choose based on use case and style preference. Choose Omega Seamaster 300m (300m WR) for diving; Tudor Black Bay GMT (200m) suits everyday wear.
Seamaster 300mCommunity RatingBlack Bay GMT
50%50%
🗳️Community Vote
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Community Ratings
Omega Seamaster 300m
Value for Money
4.0
Build Quality
5.0
Movement Reliability
5.0
Daily Wearability
4.0
Resale Strength
3.0
Tudor Black Bay GMT
No community ratings yet
Frequently Asked Questions
Which is better: Omega Seamaster 300m or Tudor Black Bay GMT?▼
Both are excellent watches with different strengths. The Omega Seamaster 300m offers a larger case and costs more new. The Tudor Black Bay GMT excels in overall construction. The best choice depends on your wrist size, budget, and preferred aesthetic.
What's the price difference?▼
The Omega Seamaster 300m retails for $6k–$6k, while the Tudor Black Bay GMT is priced at $4k–$5k. Pre-owned, expect $5k–$6k and $4k–$4k respectively. Actual secondary market prices vary based on condition and demand.
How do the case sizes compare?▼
The Omega Seamaster 300m has a 42mm case diameter with 13.6mm thickness, while the Tudor Black Bay GMT measures 41mm × 14.6mm. Both have lug-to-lug measurements of 51mm and 50mm respectively. Consider your wrist size and wear style when deciding.
Which has better water resistance?▼
The Omega Seamaster 300m is water-resistant to 300m, while the Tudor Black Bay GMT offers 200m. Both are suitable for swimming and snorkeling at their respective depths. For professional diving, verify the rating exceeds 300m and includes a screw-down crown.
How do the movements compare?▼
The Omega Seamaster 300m uses a automatic Cal. 8800 with 55 hours power reserve. The Tudor Black Bay GMT features a automatic MT5652 with 70 hours power reserve. Both offer traditional mechanical craftsmanship.
Which holds value better?▼
Omega and Tudor both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $5k–$6k for the Seamaster 300m and $4k–$4k for the Black Bay GMT. Condition, service history, and box/papers significantly impact resale value for both models.
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