This is not a traditional head-to-head comparison of two finished, competing watches. Instead, it is a comparison between a complete, ready-to-wear Quartz Watch and a mechanical movement (internal component) used in watchmaking.

The choice is not about which one is better, but what you intend to do: Wear a functional watch or build/repair a mechanical watch.

Head-to-Head Comparison: Complete Watch vs. Mechanical Movement

Feature	ADDIESDIVE New Men's Watches Luxury Quartz Watch Man Sport 200M Waterproof Luminous Date Dive Wristwatch AD2068 AR Coating reloj	Sea-gull ST16S4 Movement 1654 Automatic Movement 21 Jewels Clock Movement fit Men's Watches Repair Parts
Product Type	Complete Wristwatch	Internal Mechanical Movement
Core Function	Ready-to-wear timekeeping	Component for Watchmaking/Repair
Movement Type	Quartz (Japanese Quartz 2115)	Automatic Mechanical (ST1654)
Power Source	Battery	Mainspring (Wound by wrist motion)
Accuracy	Extremely High (Quartz precision)	Good (Typical for budget mechanical)
Complications	Date	Date, Day, Sun-Moon (Day/Night Indicator)
Water Resistance	200M (20 Bar) Diver Rating	N/A (Movement only)
Case/Bezel	39mm 316L Steel Case, Ceramic Bezel	N/A (Movement only)
Target User	Everyday watch wearer, Diver	Watch repairer, Hobbyist, Modder
Price (Approx.)	$\$55 - $\$75	$\$25 - $\$35

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In-Depth Analysis

1. Fundamental Difference: Technology and Purpose

ADDIESDIVE AD2068 (Quartz Watch)

This is a consumer product designed for immediate, robust use, particularly diving. It relies on a battery-powered quartz crystal to regulate time, providing exceptional accuracy. Its value is in the complete package: a durable case, high water resistance, and a reliable, low-maintenance movement.

Sea-gull ST16S4 Movement 1654 (Automatic Movement)

This is an industrial or hobbyist component. It is the complex mechanical engine of a watch, driven by a self-winding rotor. Its value lies in its mechanical complexity and its suitability for building a custom watch (a "homage" or "mod"). It requires a case, dial, hands, and assembly to become a wearable watch.

2. Performance and Accuracy

Metric	ADDIESDIVE AD2068	Sea-gull ST16S4 Movement 1654
Timekeeping	Near Perfect. Gains/loses only a few seconds per month.	Good. Accuracy is typically measured in seconds per day (e.g., -15 to +30 seconds/day).
Maintenance	Minimal. Battery replacement every few years.	Regular servicing (oiling) required every 3-5 years.
Complications	Basic Date.	Advanced: Date, Day, Sun-Moon indicator.
Frequency	N/A (Quartz)	21,600 vibrations per hour (VPH)

3. Build Quality and Features (ADDIESDIVE Only)

Since the Sea-gull movement is an internal component, this section focuses solely on the finished ADDIESDIVE AD2068:

Pros of AD2068:

• Diver Ready: Features a professional 200M water resistance rating with a screw-down crown and case back, making it suitable for serious water sports or diving.
• Premium Materials: It uses 316L stainless steel for the case and a ceramic bezel insert, which is highly resistant to scratching.
• Luminescence: Excellent BGW9 Super Luminous material provides bright, long-lasting glow for visibility in the dark.
• Crystal: Features a K1 mineral bubble mirror glass with an Anti-Reflective (AR) coating for better clarity.
• Thin Profile: With a 39mm case diameter and a slim 12mm thickness, it wears comfortably on most wrists.

Cons of AD2068:

• K1 Crystal: While coated, K1 mineral glass is generally more susceptible to scratches than sapphire crystal.
• Quartz Movement: Lacks the romantic, smooth-sweeping second hand and complexity of a mechanical watch, which some enthusiasts prefer.

4. Unique Features (Sea-gull Only)

Since the ADDIESDIVE is a known entity, this section focuses on the unique qualities of the Sea-gull ST16S4 Movement 1654 itself:

Pros of ST16S4 (for Watchmaking):

• True Mechanical Art: It offers the beauty and complexity of a traditional timepiece with a visible oscillating balance wheel.
• Advanced Complications: The ST1654 version includes a Sun-Moon/Day-Night indicator in addition to the standard Date and Day of the Week, a feature typically found in much more expensive movements.
• Hacking and Hand-Winding: The ST16 family of movements often includes hacking (second hand stops when setting time) and can be wound manually, adding a premium feel.
• Affordable Caliber: It is one of the most cost-effective ways to power a self-built automatic watch project.

Cons of ST16S4 (as a component):

• Not a Standalone Watch: It requires significant parts and labor (case, hands, dial, assembly) to function as a complete timepiece.
• Quality Control: While Sea-gull is a major Chinese manufacturer, the quality and timekeeping consistency can be more variable than top-tier Japanese or Swiss movements.
• Delicate: Movement parts are precision components and can be easily damaged, requiring professional handling for installation or repair.

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Conclusion: Who Should Buy What?

The two products are designed for entirely different customers.

Buy the ADDIESDIVE New Men's Watches Luxury Quartz Watch Man Sport 200M Waterproof Luminous Date Dive Wristwatch AD2068 AR Coating reloj if:

• You want a robust, ready-to-wear watch right now.
• You prioritize accuracy, reliability, and low maintenance over mechanical complexity.
• You need a genuine 200M dive watch with a high-quality ceramic bezel and excellent lume.
• You are a consumer looking for a fantastic value, reliable timepiece.

Buy the Sea-gull ST16S4 Movement 1654 Automatic Movement 21 Jewels Clock Movement fit Men's Watches Repair Parts if:

• You are a watch hobbyist, modder, or watchmaker.
• You want to replace a broken movement in an existing automatic watch.
• You want to build a custom mechanical watch from scratch and need a complex, reliable, and affordable automatic movement with multiple complications (Date/Day/Sun-Moon).
• You prioritize the art and craft of mechanical watchmaking over the set-it-and-forget-it accuracy of quartz.