Is your 51-30
the real deal?
The Nixon 51-30 is a bold, oversized chronograph with a cult following in surf and action sports. Its massive 51mm case and 300m water resistance make it a statement piece. Here's how to spot a fake.
How to authenticate a 51-30
Massive 51mm Case
The 51-30's defining feature is its 51mm diameter case—one of the largest production watches made. Measure the case width (excluding crown): it should be precisely 51mm. The case should feel substantial (260g on bracelet) with thick, robust construction. Fakes are often undersized (48-49mm) or made with thin, lightweight cases that don't match the genuine heft.
Chronograph Subdials
The 51-30 Chrono has three subdials: 60-second totalizer at 9 o'clock, 30-minute totalizer at 3 o'clock, and 12-hour totalizer at 6 o'clock. The subdials should be perfectly aligned, evenly spaced, and operate smoothly via the pushers. Counterfeits often have non-functional subdials (decorative only) or incorrect subdial functions (e.g., 24-hour instead of 12-hour).
Miyota Chronograph Movement
The 51-30 Chrono uses a Japanese quartz chronograph movement from Miyota (typically OS20 or similar). The caseback should be engraved with "Japan Movt" and "300m / 30ATM." The chronograph should reset to 12 o'clock with crisp, immediate action. Fakes use unreliable movements with poor reset accuracy or misaligned hands.
Screw-Down Crown
The 51-30's crown screws down to ensure 300m water resistance. It should thread smoothly, lock tightly, and sit flush with the case when closed. The crown should be engraved or embossed with the Nixon logo. Counterfeits often have push-pull crowns (no threads), loose threading, or missing logo details—all signs of poor waterproofing.
Dial Quality & Indices
The 51-30 dial features large, bold hour indices (applied or printed) with clean edges and consistent finish. The Nixon logo and model text should be sharply printed. The date window at 4 o'clock should have a magnifying lens (on some models) and crisp date numerals. Fakes have blurry printing, misaligned indices, or cheap-looking dial finishes (matte where it should be glossy, etc.).
Heavy-Duty Bracelet
The 51-30 bracelet uses solid stainless steel links (no hollow links) with a robust fold-over clasp stamped with the Nixon logo. Links should have smooth, polished or brushed finishing with no sharp edges. The bracelet should feel substantial and not rattle. Counterfeits use hollow links, cheap clasps, or thin stamped metal that feels flimsy.
51-30 counterfeit warning signs
Undersized or Lightweight Case
If the watch feels light in the hand or the case measures less than 51mm, it's not a genuine 51-30. The 51-30 is known for its massive size and heft. Fakes often downsize to 48-49mm to save on manufacturing costs, and they use thinner cases or lower-quality steel that results in a noticeably lighter weight.
Non-Functional Chronograph
Many fake 51-30s have decorative subdials that don't function. The top pusher should start/stop the chronograph, and the bottom pusher should reset all hands to 12 o'clock. If the subdials don't move or reset incorrectly (e.g., hands land at 1 o'clock instead of 12), the watch is counterfeit.
Suspiciously Low Price
Genuine Nixon 51-30 watches retail for $400–$700 depending on materials and colorway. If you find a "51-30" for under $150, especially from an unverified seller or third-party marketplace, it's almost certainly fake. Always buy from Nixon's website, authorized retailers (Zumiez, Nordstrom), or reputable pre-owned dealers.
Scan your 51-30 now
Upload a few photos and get an AI-powered authenticity report in seconds. Your first scan is free.
Start ScanningFor high-value purchases, we recommend pairing your AI scan with an in-person inspection by a certified watchmaker for complete peace of mind.
Frequently asked questions
How big is the Nixon 51-30?
The Nixon 51-30 has a massive 51mm case diameter and weighs approximately 260 grams (on the steel bracelet). It sits roughly 15mm tall on the wrist. The name '51-30' refers to the 51mm case size and 300-meter (30 bar) water resistance rating. It's one of the largest production watches available and is designed to make a bold statement.
What movement is in the Nixon 51-30 Chrono?
The Nixon 51-30 Chrono uses a Japanese quartz chronograph movement from Miyota (Citizen). It features three subdials for chronograph functions (60-second, 30-minute, and 12-hour totalizers) and a date window at 4 o'clock. The movement is reliable and accurate, designed to withstand the watch's extreme water resistance rating.
Is the Nixon 51-30 good for diving?
Yes, the Nixon 51-30 is rated for 300 meters (30 ATM) of water resistance, making it suitable for recreational diving and all water sports. It features a screw-down crown and solid case construction. However, it lacks a unidirectional dive bezel (it has a fixed bezel or bidirectional bezel depending on the variant), so it's not a true ISO-certified dive watch.