This is a head-to-head comparison of two distinct Chinese mechanical watch offerings: the ADDIESDIVE Diver Watch (a robust dive tool) and the New Seagull Pilot Watch (a feature-rich, dressier aviator).

The ADDIESDIVE offers superior water resistance and a classic, durable dive watch build with a proven Japanese movement. The Seagull, from a more historically significant brand, offers a more complex, multi-function dial design with a proprietary Chinese movement.

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Head-to-Head Comparison: ADDIESDIVE AD2084 vs. Seagull 819.33.6080H

Feature	ADDIESDIVE Diver Watch Luxury Business Sapphire AR Coated 200m Waterproof Luminous NH35 Automatic Mechanical Watch AD2084 New	New Seagull Men's Watch Fashion Multifunction Belt Sapphire Luminous Automatic Mechanical Watch Pilot Series 819.33.6080H
Primary Style	Classic Dive Watch / Tool Watch	Multifunction Pilot Watch / Dress-Aviator
Movement	Japan Seiko NH35A Automatic (Hacking/Hand-winding)	Seagull ST2502 Automatic (Hacking/Hand-winding)
Water Resistance (WR)	200 meters (20 ATM / 660 ft)	50 meters (5 ATM / 167 ft)
Crystal	Sapphire Crystal (Bubble Mirror) with AR Coating	Synthetic Sapphire Crystal
Case Diameter	39mm	43mm
Case Thickness	~14.5mm (due to bubble crystal)	~13mm - 13.5mm
Bezel	120-Click Unidirectional Ceramic Bezel (Fully Lumed)	Fixed, Non-Rotating (Pilot Style)
Key Complications	Date Window at 3 o'clock	Day of Week, Date, and potentially Dual Time Zone (Sub-dials at 9 and 3)
Luminosity	C3/BGW9 Super Luminous (Hands, Indices, Bezel)	Luminous Hands and Markers

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In-Depth Feature Comparison

1. Design and Aesthetic

ADDIESDIVE Diver Watch Luxury Business Sapphire AR Coated 200m Waterproof Luminous NH35 Automatic Mechanical Watch AD2084 New This watch is a vintage-inspired dive watch, often referencing classic "Sub" designs. Its key aesthetic features include:

• Size: A modest 39mm diameter makes it suitable for smaller to medium wrists and gives it a highly wearable, classic feel.
• Crystal: The Bubble Mirror Sapphire Crystal is a standout feature, creating an attractive distortion effect and adding to the vintage look while providing excellent scratch resistance.
• Build: It has a highly functional look with a thick, lumed ceramic unidirectional dive bezel.
• Bracelet: Comes on a solid stainless steel bracelet with a fine-adjustable folding buckle, emphasizing its tool-watch nature.

New Seagull Men's Watch Fashion Multifunction Belt Sapphire Luminous Automatic Mechanical Watch Pilot Series 819.33.6080H This timepiece is a large, multifunction pilot watch with a more complex, dressy-military feel.

• Size: At 43mm in diameter and 51mm lug-to-lug, this is a significantly larger watch with considerable wrist presence, typical of pilot watches.
• Complications: The prominent sub-dials at 3 and 9 o'clock display the Day and Date, giving it a distinctive "Owl Eye" layout that adds to its complex and technical look.
• Caseback: A transparent caseback allows for viewing of the decorated Seagull ST2502 movement, a feature missing from the Addiesdive.
• Strap: It comes on a leather strap, aligning with its pilot/business style, although the quality of the strap is sometimes noted as a potential weak point.

2. Movement and Performance

Watch	Movement	Type/Jewels	Beat Rate	Power Reserve	Key Differentiator
Addiesdive	Japan NH35A	Japanese Automatic / 24 Jewels	21,600 vph (3 Hz)	41 Hours	Proven, Workhorse Reliability: The NH35 is ubiquitous, highly reliable, and easy to service globally.
Seagull	Seagull ST2502	Chinese Automatic / 29 Jewels	21,600 vph (3 Hz)	~40 Hours	In-house Complications: A more complex movement (Day/Date sub-dials) and often decorated, offering a "higher-end" aesthetic for the price.

The Addiesdive prioritizes long-term, dependable function with the industry-standard NH35 movement. The Seagull offers a more technically impressive and visually interesting movement (ST2502) with extra complications, though the long-term reliability of Chinese-made movements in this price bracket is sometimes cited as a question mark compared to the NH35.

3. Durability and Water Resistance (The Critical Difference)

The water resistance is the starkest difference between these two watches:

• ADDIESDIVE AD2084: With 200m WR and a screw-down crown, this is a true diver's watch suitable for all water activities, including Scuba diving. The use of a ceramic bezel adds scratch resistance to the most exposed part of the watch.
• Seagull 819.33.6080H: The 50m WR rating means it is suitable for splashes, light rain, and possibly showering, but it is not recommended for swimming, snorkeling, or diving.

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Pros and Cons

ADDIESDIVE Diver Watch AD2084 New

Pros	Cons
Excellent Water Resistance (200m) for serious water activities.	Thicker than some dive watches (~14.5mm), largely due to the bubble crystal.
Bubble Mirror Sapphire Crystal is a high-end, vintage-look feature.	Dial is less visually complex (standard three-hand with date).
Reliable NH35 Movement is a trusted, low-maintenance workhorse.	Styling is an homage to classic dive watches.
High-quality Ceramic bezel insert.
Smaller 39mm case size offers comfortable wear.

New Seagull Pilot Series 819.33.6080H

Pros	Cons
More Complicated Dial with Day and Date sub-dials ("Owl Eye").	Low Water Resistance (50m) is only suitable for daily wear/splashes.
Larger 43mm Case offers a substantial wrist presence (Pilot Watch style).	Large 51mm lug-to-lug may overhang smaller wrists.
Seagull ST2502 Movement is proprietary, complex, and visually interesting through the display caseback.	The leather strap is noted in reviews as being of potentially lower quality.
Brand history: Seagull is a highly respected Chinese watch manufacturer.	Less common movement (ST2502) may be slightly harder to service than the NH35.

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VERSUS Verdict: Who Should Buy What?

Buy the ADDIESDIVE Diver Watch Luxury Business Sapphire AR Coated 200m Waterproof Luminous NH35 Automatic Mechanical Watch AD2084 New if:

You prioritize utility, durability, and a classic, manageable size. This is the clear choice for a rugged, reliable, and genuine tool watch. If you plan on swimming, snorkeling, or diving, the 200m water resistance and screw-down crown are non-negotiable features that the Addiesdive offers. The 39mm case makes it versatile for all-day wear, and the NH35 ensures reliable performance for years to come.

Buy the New Seagull Men's Watch Fashion Multifunction Belt Sapphire Luminous Automatic Mechanical Watch Pilot Series 819.33.6080H if:

You prioritize dial complexity, brand heritage, and wrist presence. This watch is a fashion-forward, multifunction timepiece designed for land use. If you appreciate the look of complicated movements and desire the Day/Date sub-dial features in a large, bold 43mm pilot watch case, the Seagull is the better aesthetic choice. It appeals to the watch enthusiast who values a display caseback showing a proprietary, in-house Chinese movement (ST2502).