Orient Mako 40 Green vs Seiko Prospex "Turtle"
Two divers compared — $250–$500 vs $500–$1,000
Quick Verdict
The Orient Mako 40 Green ($250–$500) offers Orient In-House Automatic (Hacking, Hand-Winding) precision in the tier below the Seiko Prospex "Turtle" ($500–$1,000). The Mako 40 Green measures 40mm and is rated 200m (20 ATM). The Prospex "Turtle" counters with Made in Japan craftsmanship and 200m (20 ATM) Diver water resistance. Both are exceptional divers 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 | Orient Mako 40 Green | Seiko Prospex "Turtle" |
|---|---|---|
| Price | $250–$500 | $500–$1,000 |
| Case Size | 40mm | 45mm |
| Movement | Automatic Caliber F6722 | Automatic Caliber 4R36 |
| Caliber Type | Orient In-House Automatic (Hacking, Hand-Winding) | In-House Automatic Manufacture |
| Power Reserve | 40 Hours | 41 Hours |
| Water Resistance | 200m (20 ATM) | 200m (20 ATM) Diver |
| Crystal | Sapphire Crystal | Sapphire Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Orient's design language vs Seiko's approach
The Orient Mako 40 Green features a Stainless Steel case at 40mm with Sapphire Crystal protection. The Seiko Prospex "Turtle" offers Stainless Steel construction at 45mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber F6722 vs Automatic Caliber 4R36
The Mako 40 Green runs the Automatic Caliber F6722 (Orient In-House Automatic (Hacking, Hand-Winding), 40 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Prospex "Turtle" uses the Automatic Caliber 4R36 (In-House Automatic Manufacture, 41 Hours reserve) at 21,600 vph (3 Hz). The Prospex "Turtle" offers a longer power reserve.
Wearability & Fit
40mm vs 45mm — different wrist presence
At 40mm, the Mako 40 Green wears more compactly on smaller wrists compared to the Prospex "Turtle" at 45mm. Water resistance differs: 200m (20 ATM) vs 200m (20 ATM) Diver.
Value & Cost of Ownership
Orient sits in the lower tier
The Orient Mako 40 Green sits at $250–$500 and the Seiko Prospex "Turtle" at $500–$1,000. On the specs that outlast any price: the Mako 40 Green uses Sapphire Crystal with 40 Hours, against Sapphire Crystal and 41 Hours on the Prospex "Turtle". Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 200m (20 ATM) Diver
The Mako 40 Green is rated to 200m (20 ATM) while the Prospex "Turtle" handles 200m (20 ATM) Diver. Both offer identical water resistance ratings.
Our Verdict
Orient
Mako 40 Green
Choose the Orient Mako 40 Green if you prioritize Orient In-House Automatic (Hacking, Hand-Winding) engineering, Made in Japan craftsmanship, and 200m (20 ATM) water resistance. At $250–$500, it delivers Automatic Caliber F6722 with 40 Hours power reserve.
Check Price on AmazonSeiko
Prospex "Turtle"
Choose the Seiko Prospex "Turtle" if you value In-House Automatic Manufacture technology, Made in Japan heritage, and 45mm proportions. At $500–$1,000, the Automatic Caliber 4R36 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Orient Mako 40 Green and Seiko Prospex "Turtle" represent two distinct approaches to the diver category — the Orient bringing Made in Japan tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
More Comparisons
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.