Maurice Lacroix Aikon Automatic vs Seiko 5 Sports 5KX
Maurice Lacroix's diver meets Seiko's timepiece
Quick Verdict
The Seiko 5 Sports 5KX ($250–$500) delivers Seiko In-House Automatic technology in the tier below the Maurice Lacroix Aikon Automatic ($1,500–$2,500). The 5 Sports 5KX measures 42.5mm and is rated 100m (10 ATM). The Aikon Automatic justifies its premium with Swiss Made heritage and Automatic ML115. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Maurice Lacroix Aikon Automatic | Seiko 5 Sports 5KX |
|---|---|---|
| Price | $1,500–$2,500 | $250–$500 |
| Case Size | 42mm | 42.5mm |
| Movement | Automatic ML115 | Automatic Caliber 4R36 |
| Caliber Type | Automatic (Sellita SW200-1 base) | Seiko In-House Automatic |
| Power Reserve | 38 Hours | 41 Hours |
| Water Resistance | 200m (20 ATM) | 100m (10 ATM) |
| Crystal | Sapphire Crystal | Hardlex Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Maurice Lacroix's design language vs Seiko's approach
The Maurice Lacroix Aikon Automatic features a Stainless Steel case at 42mm with Sapphire Crystal protection. The Seiko 5 Sports 5KX offers Stainless Steel construction at 42.5mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic ML115 vs Automatic Caliber 4R36
The Aikon Automatic runs the Automatic ML115 (Automatic (Sellita SW200-1 base), 38 Hours power reserve) at 28,800 vph (4 Hz) frequency. The 5 Sports 5KX uses the Automatic Caliber 4R36 (Seiko In-House Automatic, 41 Hours reserve) at 21,600 vph (3 Hz). The 5 Sports 5KX offers a longer power reserve.
Wearability & Fit
42mm vs 42.5mm — different wrist presence
At 42mm, the Aikon Automatic wears more compactly on smaller wrists compared to the 5 Sports 5KX at 42.5mm. Water resistance differs: 200m (20 ATM) vs 100m (10 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Maurice Lacroix Aikon Automatic sits at $1,500–$2,500 and the Seiko 5 Sports 5KX at $250–$500. On the specs that outlast any price: the Aikon Automatic uses Sapphire Crystal with 38 Hours, against Hardlex Crystal and 41 Hours on the 5 Sports 5KX. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 100m (10 ATM)
The Aikon Automatic is rated to 200m (20 ATM) while the 5 Sports 5KX handles 100m (10 ATM). The Aikon Automatic is better suited for water activities.
Our Verdict
Maurice Lacroix
Aikon Automatic
Choose the Maurice Lacroix Aikon Automatic if you prioritize Automatic (Sellita SW200-1 base) engineering, Swiss Made craftsmanship, and 200m (20 ATM) water resistance. At $1,500–$2,500, it delivers Automatic ML115 with 38 Hours power reserve.
Check Price on AmazonSeiko
5 Sports 5KX
Choose the Seiko 5 Sports 5KX if you value Seiko In-House Automatic technology, Made in Japan heritage, and 42.5mm proportions. At $250–$500, the Automatic Caliber 4R36 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Maurice Lacroix Aikon Automatic and Seiko 5 Sports 5KX represent two distinct approaches to fine watchmaking — the Maurice Lacroix bringing Swiss Made tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
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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.