Citizen Promaster Sea Eco-Drive Diver vs Longines Master Collection Moonphase
Citizen's diver meets Longines's dress watch
Quick Verdict
The Citizen Promaster Sea Eco-Drive Diver ($250–$500) offers Citizen Eco-Drive (Solar Quartz) precision in the tier below the Longines Master Collection Moonphase ($2,500–$5,000). The Promaster Sea Eco-Drive Diver measures 44mm and is rated 200m (20 ATM) ISO 6425. The Master Collection Moonphase counters with Swiss Made craftsmanship and 30m (3 ATM) water resistance. Both are exceptional watches for their respective tiers.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Citizen Promaster Sea Eco-Drive Diver | Longines Master Collection Moonphase |
|---|---|---|
| Price | $250–$500 | $2,500–$5,000 |
| Case Size | 44mm | 40mm |
| Movement | Eco-Drive Caliber E168 | Automatic Caliber L899 |
| Caliber Type | Citizen Eco-Drive (Solar Quartz) | Automatic (ETA A31.L91 base) |
| Power Reserve | — | 72 Hours |
| Water Resistance | 200m (20 ATM) ISO 6425 | 30m (3 ATM) |
| Crystal | Mineral Crystal | Sapphire Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Citizen's design language vs Longines's approach
The Citizen Promaster Sea Eco-Drive Diver features a Stainless Steel case at 44mm with Mineral Crystal protection. The Longines Master Collection Moonphase offers Stainless Steel construction at 40mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Eco-Drive Caliber E168 vs Automatic Caliber L899
The Promaster Sea Eco-Drive Diver runs the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard power reserve) at standard frequency. The Master Collection Moonphase uses the Automatic Caliber L899 (Automatic (ETA A31.L91 base), 72 Hours reserve) at 25,200 vph (3.5 Hz). The Master Collection Moonphase offers a longer power reserve.
Wearability & Fit
44mm vs 40mm — different wrist presence
At 44mm, the Promaster Sea Eco-Drive Diver has a bolder wrist presence compared to the Master Collection Moonphase at 40mm. Water resistance differs: 200m (20 ATM) ISO 6425 vs 30m (3 ATM).
Value & Cost of Ownership
Citizen sits in the lower tier
The Citizen Promaster Sea Eco-Drive Diver sits at $250–$500 and the Longines Master Collection Moonphase at $2,500–$5,000. On the specs that outlast any price: the Promaster Sea Eco-Drive Diver uses Mineral Crystal with a standard reserve, against Sapphire Crystal and 72 Hours on the Master Collection Moonphase. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) ISO 6425 vs 30m (3 ATM)
The Promaster Sea Eco-Drive Diver is rated to 200m (20 ATM) ISO 6425 while the Master Collection Moonphase handles 30m (3 ATM). The Promaster Sea Eco-Drive Diver is better suited for water activities.
Our Verdict
Citizen
Promaster Sea Eco-Drive Diver
Choose the Citizen Promaster Sea Eco-Drive Diver if you prioritize Citizen Eco-Drive (Solar Quartz) engineering, Made in Japan craftsmanship, and 200m (20 ATM) ISO 6425 water resistance. At $250–$500, it delivers Eco-Drive Caliber E168 with solid power reserve.
Check Price on AmazonLongines
Master Collection Moonphase
Choose the Longines Master Collection Moonphase if you value Automatic (ETA A31.L91 base) technology, Swiss Made heritage, and 40mm proportions. At $2,500–$5,000, the Automatic Caliber L899 with 72 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Citizen Promaster Sea Eco-Drive Diver and Longines Master Collection Moonphase represent two distinct approaches to fine watchmaking — the Citizen bringing Made in Japan tradition while Longines delivers Swiss Made engineering.
Frequently Asked Questions
More Comparisons
Frederique Constant Slimline Moonphase vs Longines Master Moonphase
Two moonphase dress watches under $5,000
Tag Heuer Carrera Chronograph vs Citizen Promaster Sea Eco-Drive Diver
Tag Heuer's chronograph meets Citizen's diver
Tag Heuer Carrera Chronograph vs Longines Master Collection Moonphase
Tag Heuer's chronograph meets Longines's dress watch
Explore These Watches
How This Page Was Made
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.