WatchComparisonAI
Compare watches with collector-grade detail.
Search references and evaluate proportions, movement specs, bracelet engineering, and real-world wearability side by side.
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Compare Watches With Collector-Grade Detail
Evaluate references side by side across case proportions, movement architecture, bracelet engineering, MSRP, and real-world wearability.
69watchesWatches
11brandsBrands
Comparison bench
Pick two references to compare proportions, specs, and buying context.
Collector read
The proportions tell the first story.
This view is built for the details enthusiasts usually have to hunt across reviews: wrist presence, case height, bracelet taper, clasp behavior, and practical adjustability.
Case diameter
Watch A +3.0 mm
Watch A42 mm
Watch B39 mm
Lug-to-lug
Watch B +0.6 mm
Watch A47.5 mm
Watch B48.1 mm
Thickness
Watch A +2.1 mm
Watch A13.8 mm
Watch B11.7 mm
AI Pair Review
Ask AI for a head-to-head enthusiast verdict.
Scores are based on the saved specs and wearability notes for these two watches, then weighted against enthusiast priorities like fit, movement quality, practicality, finishing, value, and collector appeal.
Watch A Purchase Option
Omega Seamaster Planet Ocean 600M
217.30.42.21.01.001
Available from Exquisite Timepieces. Open the retailer listing to view current availability, pricing, and purchase details.
Watch B Purchase Option
Longines HydroConquest 39mm Black Lacquered Polished
L3.779.4.56.6
Available from Exquisite Timepieces. Open the retailer listing to view current availability, pricing, and purchase details.
Watch A
View Details217.30.42.21.01.001
Omega
Seamaster Planet Ocean 600M
- MSRP
- $9,200
- Size
- 42 mm
- Movement
- Automatic
- Water
- 600 m
Watch B
View DetailsL3.779.4.56.6
Longines
HydroConquest HydroConquest 39mm Black Lacquered Polished
- MSRP
- $2,200
- Size
- 39 mm
- Movement
- Automatic
- Water
- 300 m
Buying Context
- MSRP
- $9,200
- $2,200
- Brand
- Omega
- Longines
- Collection
- Seamaster
- HydroConquest
- Model
- Planet Ocean 600M
- HydroConquest 39mm Black Lacquered Polished
- Reference
- 217.30.42.21.01.001
- L3.779.4.56.6
Fit And Case
- Case Size
- 42 mm
- 39 mm
- Thickness
- 13.79 mm
- 11.7 mm
- Lug-to-Lug
- 47.5 mm
- 48.1 mm
- Lug Width
- 21 mm
- 20 mm
- Weight
- 177 g
- 167 g
- Case Material
- Steel
- Stainless steel and ceramic bezel
- Water Resistance
- 600 m
- 300 m
- Crown
- Screw-in crown
- Screw-in crown
- Helium Valve
- Yes
- Not listed
- Caseback
- Transparent caseback
- Screw-down
- Caseback Details
- Not listed
- Not listed
Bezel, Crystal, And Dial
- Bezel Type
- Unidirectional rotating bezel
- Unidirectional rotating bezel
- Bezel Material
- Ceramic
- Ceramic bezel
- Bezel Insert
- Not listed
- Not listed
- Crystal
- Domed scratch-resistant sapphire crystal
- Sapphire crystal
- Crystal Coating
- Anti-reflective treatment inside
- Several layers of anti-reflective coating on both sides
- Dial Color
- Black
- Black lacquered polished
- Dial Texture
- Not listed
- Not listed
- Dial Finish
- Not listed
- Black lacquered polished
- Indices
- Not listed
- Applied indexes with Swiss Super-LumiNova
- Lume
- Super-LumiNova
- Swiss Super-LumiNova
Movement And Function
- Movement Type
- Automatic
- Automatic
- Caliber
- Omega 8912
- L888.5
- Power Reserve
- 60 hours
- 72 hours
- Jewels
- 39
- Not listed
- Frequency
- 25200 vph / 3.5 Hz
- 25200 vph / 3.5 Hz
- Accuracy
- Not listed
- Not listed
- COSC Certified
- Not listed
- Not listed
- METAS Certified
- Yes
- Not listed
- Magnetic Resistance
- 15000 gauss
- Not listed
- Date
- No
- Yes
- Chronograph
- No
- No
- GMT
- No
- No
Bracelet, Clasp, And Wearability
- Bracelet Type
- Steel bracelet
- Stainless steel bracelet
- Bracelet Material
- Steel
- Stainless steel
- Bracelet Finish
- Not listed
- Not listed
- Link Design
- Not listed
- Not listed
- Bracelet Taper
- 21 mm to 16.5 mm
- 20 mm to 18 mm
- Clasp Type
- Foldover clasp with comfort setting and diver extension
- Double security folding clasp
- Micro-Adjustment
- 9.7 mm
- Micro adjustment system
- Micro-Adjustment Positions
- Not listed
- Not listed
- Adjustment System
- Comfort setting and diver extension
- Micro adjustment system
- Adjustment Details
- Not listed
- Not listed
- Tool-Free Adjustment
- Not listed
- Not listed