This is a detailed head-to-head comparison between two popular, yet distinct, players in the affordable mechanical diver watch segment. The ADDIESDIVE offers superior dive specifications and renowned illumination at a budget price, while the Seagull provides a respected, in-house mechanical movement and historical brand value.

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Head-to-Head Comparison: ADDIESDIVE vs. Seagull Diver

Summary Table

Feature	ADDIESDIVE Men's Automatic Mechanical Watch Sapphire Glass Super Luminous 200M Waterproof 316L Stainless Steel Leisure Man Watch	Seagull Diving Men Watch 45mm Ocean Series Mechanical Automatic Watches 100 Meters Waterproof Luminous Watches for Man 6105reloj
Movement	Japan Seiko NH35A Automatic	Seagull ST2500 Automatic (In-House)
Vibrations per Hour	21,600 vph	21,600 vph
Hacking/Hand-Winding	Yes / Yes	Yes / Yes
Water Resistance	200 Meters (660 ft) (Superior)	100 Meters (330 ft)
Crystal	Synthetic Sapphire Crystal	Synthetic Sapphire Crystal
Case Material	316L Stainless Steel	316L Stainless Steel
Case Diameter (Approx.)	39mm - 41mm (Varies by model)	44mm - 45mm
Luminosity	C3 or BGW9 Super-LumiNova (Excellent/Torch-Like)	Standard Luminous (Good)
Price (Estimated)	$99 - $149 USD (Excellent Value)	$200 - $300 USD (Higher Tier)

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In-Depth Analysis

1. Movement and Performance

The primary difference lies in the movements, which define the philosophy of each watch.

• ADDIESDIVE (NH35A): This watch uses the highly popular Japanese Seiko NH35A movement. It is the definition of a robust, reliable, and easily serviceable workhorse. It beats at 21,600 vph and includes desirable features like hacking (stopping the second hand for precise time setting) and hand-winding. Its power reserve is about 41 hours. The key takeaway is universal reliability and low maintenance cost.
• Seagull (ST2500): The Seagull watch is powered by the ST2500, an in-house Chinese-made automatic movement. Seagull is the largest manufacturer of mechanical watch movements globally and has a long, respected history dating back to 1958 [cite: 10, 10 in previous search]. The ST2500 is considered a sophisticated caliber with features like hand-winding and hacking seconds. This offers a higher sense of horological pedigree and is a more unique choice for enthusiasts who appreciate in-house Chinese watchmaking.

Verdict: The NH35A is the proven, dependable movement. The ST2500 offers more horological interest as a true in-house movement from a historic brand.

2. Dive Specifications and Durability

The ADDIESDIVE is the undisputed winner in the area of true diving capability.

• ADDIESDIVE: With a 200-meter (660ft) water resistance rating, a screw-down crown and case back, and typically a unidirectional rotating bezel, the ADDIESDIVE is engineered to meet ISO 6425 dive watch standards (though it may not be officially certified). The inclusion of a sapphire crystal and 316L stainless steel case ensures excellent scratch and corrosion resistance.
• Seagull: The Ocean Series offers 100 meters (330 ft) of water resistance. While this is perfectly adequate for swimming, snorkeling, and nearly all surface water activities, it is generally not considered a "professional" dive rating for deep-sea use, making it more of a robust sports watch than a true diver. It also features a sapphire crystal and 316L stainless steel.

Verdict: For serious water sports or peace of mind, the ADDIESDIVE 200M rating is superior.

3. Build Quality and Aesthetics

• ADDIESDIVE: Known for focusing on "specs for the price," ADDIESDIVE consistently delivers high-quality components like sapphire, ceramic bezels (in many models), and robust 316L cases. User reviews frequently praise the "torch-like" quality of its Super-LumiNova (C3 or BGW9) and the solid feel of the bracelet and clasp for its price point. The styling is almost universally a classic "homage" design (e.g., to the Rolex Submariner).
• Seagull: The Seagull Ocean Series typically features a larger, bolder 44mm-45mm case. While the build quality is solid, the emphasis is often on the Seagull name and the unique aesthetic of their Ocean Series design, which gives the watch a distinctive look that moves away from common "homage" models. The finishing is generally seen as good, fitting its mid-range budget category.

Luminosity: The ADDIESDIVE is widely cited for having excellent, long-lasting lume that is a standout feature, often outperforming watches many times its price.

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Pros and Cons

ADDIESDIVE Men's Automatic Mechanical Watch Sapphire Glass Super Luminous 200M Waterproof 316L Stainless Steel Leisure Man Watch	Seagull Diving Men Watch 45mm Ocean Series Mechanical Automatic Watches 100 Meters Waterproof Luminous Watches for Man 6105reloj
Pros	Pros
✅ 200M Water Resistance: True diver capability.	✅ In-House Movement (ST2500): Greater horological value and brand prestige [cite: 1, 10 in previous search].
✅ Superior Lume: Outstanding brightness and longevity (C3/BGW9).	✅ Unique Design Language: Less reliant on "homage" styling.
✅ Exceptional Value: Often half the price of the Seagull, offering incredible specs for the cost.	✅ Established Brand: Seagull has a respected history in Chinese watchmaking (since 1958) [cite: 10 in previous search].
✅ NH35A Movement: Widely serviceable and reliable.	✅ Large Presence: 44mm-45mm case size makes a bold statement.
Cons	Cons
❌ Brand Heritage: Newer brand with less collector recognition than Seagull.	❌ 100M Water Resistance: Limits its use for serious diving or high-impact water activities.
❌ Design: Often a direct "homage" of other luxury divers.	❌ Higher Price: Significantly more expensive than the ADDIESDIVE.
❌ Finish: Finishing is excellent for the price, but Seagull may have better overall refinement.	❌ Potential Servicing: ST2500 movements may be harder to service outside of China compared to the ubiquitous NH35.

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Conclusion: Who Should Buy What?

This comparison is a classic choice between Value/Utility and Horological Merit/Originality.

Buy the ADDIESDIVE Men's Automatic Mechanical Watch Sapphire Glass Super Luminous 200M Waterproof 316L Stainless Steel Leisure Man Watch if:

You prioritize maximum performance specs and ultimate value for money. If you are an actual diver, enjoy swimming, or simply want the best possible combination of a sapphire crystal, NH35 automatic movement, 200M water resistance, and torch-like lume for the lowest price, the ADDIESDIVE is the better tool watch. It is the no-brainer option for a rugged, high-spec daily beater.

Buy the Seagull Diving Men Watch 45mm Ocean Series Mechanical Automatic Watches 100 Meters Waterproof Luminous Watches for Man 6105reloj if:

You are a watch enthusiast who values a brand's heritage and a true in-house movement (ST2500). If you want a large, bold-wearing 45mm sports watch that makes a statement, comes from a historically significant Chinese brand, and features an internally developed movement, the Seagull offers the more unique and enthusiast-driven experience. Your usage will be primarily desk-diving, swimming, and general wear, rather than deep saturation diving.