This is an in-depth comparison of three popular Pagani Design models, each paying tribute to classic watch designs. The key differentiators lie in size, complication, and movement.

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2025 New PAGANI DESIGN DD40 vs Pagani design DD36 vs Pagani design 1645: Head-to-Head

Executive Summary & Key Features

Feature	2025 New PAGANI DESIGN DD40 Two Tone Men Watches Mechanical Top Brand Luxury Automatic Watch Men 100M Waterproof Watches For Men (PD-1783)	PAGANI DESIGN DD36 Mens Watches Rose Gold Luxury Automatic Watch For Men Mechanical Wristwatch AR Sapphire Waterproof Clock Gift (PD-1752)	Pagani design 1645 (PD-1645)
Case Diameter	40 mm	36 mm	42 mm
Design Style	Day-Date Tribute	Day-Date Tribute (Smaller Wrist)	Datejust Tribute
Key Complication	Day and Date	Day and Date	Date Only
Movement	Seiko NH36A (Automatic, Hacking, Hand-winding)	Seagull ST16 or Seiko NH36A (Check retailer)	Seiko NH35A (Automatic, Hacking, Hand-winding)
Crystal	Sapphire Crystal with AR Coating	Sapphire Crystal with AR Coating	Sapphire Crystal
Water Resistance	10 Bar (100m) with Screw-down Crown	10 Bar (100m)	10 Bar (100m)
Bracelet	President-style (Typically)	President-style (Typically)	Jubilee-style
Price (Estimated)	Mid-to-High Tier for Pagani Design	Mid-to-Low Tier for Pagani Design	Low-to-Mid Tier for Pagani Design

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Detailed Comparison

1. Design & Dimensions (The "Look" and "Feel")

The primary difference among these models is the iconic style they pay tribute to and, most importantly, their size.

• 2025 New PAGANI DESIGN DD40 (40mm): This watch hits the modern sweet spot for men's dress and sport-dress watches. At 40mm diameter and a slim 12mm thickness, it offers a substantial presence without being overly bulky. It features the signature Day-Date layout: a date cyclops at 3 o'clock and the full day of the week displayed in an arched window at 12 o'clock. The DD40 typically comes on a "President-style" bracelet, known for its semi-circular three-piece links, giving it a solid, classic luxury feel.
• PAGANI DESIGN DD36 (36mm): This is the vintage/classic-sized version of the Day-Date homage. The 36mm case diameter is a perfect choice for those with smaller wrists, or for anyone who prefers a more discreet, traditional, or true-to-era fit. Its 12mm thickness ensures it slides easily under a shirt cuff. Like the DD40, it features the Day-Date complication.
• Pagani design 1645 (42mm): This watch is an homage to a different classic style (Datejust), prioritizing a larger presence. At 42mm diameter, it is the largest of the three. It is distinct in its complication, featuring a Date-Only window at 3 o'clock. A significant visual difference is the bracelet: the PD-1645 is explicitly sold on a Jubilee-style bracelet, characterized by its five-piece links, which gives it a dressier, more shimmering aesthetic compared to the President-style bracelets of the DD models. The case is also a very manageable 12mm thick.

2. Performance & Movement

The choice of movement is a critical technical difference.

• DD40 (Seiko NH36A): This is the most feature-rich and reliable movement in the group. The NH36A is a Japanese automatic mechanical movement, which is highly respected for its robustness and ease of service. Crucially, it provides the Day and Date complication with the added benefit of hacking (the second hand stops when setting the time) and hand-winding (you can manually wind the watch via the crown).
• DD36 (Seagull ST16 or Seiko NH36A): The DD36 can be found with two different movements: the Chinese Seagull ST16 or the Seiko NH36A. The Seagull ST16 is a solid, budget-friendly movement, but the Seiko NH36A is generally considered the more reliable and higher-quality option. Potential buyers should verify which movement is included with their specific purchase, as the NH36A is considered "miles better" than the Seagull ST16 by some enthusiasts.
• 1645 (Seiko NH35A): The NH35A is the date-only version of the Seiko movements. It is a workhorse movement known for its durability, hacking, and hand-winding capabilities. It is an excellent, reliable movement, but it only powers the Date complication, lacking the day-of-the-week display seen on the DD models.

3. Build Quality (Crystal, Water Resistance)

All three watches offer excellent value for their price bracket, sharing high-tier features:

• Crystal: All three models utilize a scratch-resistant Sapphire Crystal. The DD models (DD40 and DD36) are often noted to include an Anti-Reflective (AR) coating on the sapphire, which can improve dial legibility in bright light.
• Water Resistance (WR): All three feature a respectable 10 Bar (100m) water resistance. This rating is suitable for everyday use, including showering, swimming, and rain exposure. The DD40 is explicitly noted to have a screw-down crown, which is a significant feature for maintaining its water resistance integrity.

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Pros & Cons

Model	Pros	Cons
DD40 (40mm)	Best combination of modern size (40mm) and reliable NH36A Day-Date movement. Screw-down crown for 100m WR. Great wrist presence.	Butterfly clasp (common for the President bracelet) typically lacks micro-adjustment, making sizing difficult. Slightly thicker than its 36mm counterpart.
DD36 (36mm)	Classic, discreet vintage sizing is perfect for smaller wrists. Highly versatile and comfortable. Offers the Day-Date complication in a compact package.	May come with the less-desirable Seagull ST16 movement (buyer must confirm if NH36A is included). May be too small for men who prefer modern proportions.
1645 (42mm)	Largest size (42mm) for maximum wrist presence. Jubilee bracelet offers a distinctly dressier look. Uses a reliable Seiko NH35A movement.	Date-Only complication (no day display) may be a drawback for those seeking the Day-Date look. The 42mm size may be too large for some buyers.

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Who Should Buy What? (Recommendation)

Watch	Recommended Buyer	Reason
2025 New PAGANI DESIGN DD40	The Modern Enthusiast	Buy this if you want the classic Day-Date look in a contemporary, versatile 40mm size, backed by the reliable and feature-rich Seiko NH36A movement. It’s the best all-rounder and value proposition in the group.
PAGANI DESIGN DD36	The Traditionalist or Smaller Wrist Buyer	Choose this if you prefer a classic, understated, and historically accurate 36mm size. It's ideal for thinner wrists or those seeking a more elegant, less imposing aesthetic. Crucially, ensure you purchase the version with the Seiko NH36A movement.
Pagani design 1645	The Big Watch/Jubilee Fan	Go for this if your priority is maximum wrist presence at 42mm and you prefer the highly detailed, shimmering look of the Jubilee bracelet and the cleaner dial of a Date-Only complication.