Watch Info:
Manufacturer: Rolex
Model: Cosmograph Daytona "Zenith"
Condition: Pre-Owned - Excellent
Reference: 16520
Year: 1998 (U-Serial)
Box: Yes
Papers: Yes
Accessories: Complete Set (Inner & Outer Presentation Boxes, Warranty Certificate, Daytona Booklet, Your Oyster Booklet, Red Hangtag, Leather Guarantee Wallet, Full Bracelet Links; minus Serialized Green Tag)
Notes: The reference 16520 Cosmograph Daytona holds legendary status as Rolex's first automatic chronograph. Powered by the iconic Calibre 4030—a heavily modified movement based on the famous Zenith El Primero ebauche—this U-serial example from 1998 represents one of the final production runs before the transition to in-house movements. Featuring a sleek black dial with contrasting silver sub-register rings and a stainless steel tachymeter bezel, this timepiece comes nearly complete as a full set (minus only the serialized green tag) in overall excellent condition.
Condition Assessment:
Overall Condition: Pre-Owned - Excellent; the timepiece retains strong, defined case geometry with thick lugs, crisp bevels, and light surface wear consistent with careful handling.
Dial, Hands, & Crystal: The gloss black dial, silver sub-register rings, luminous markers, and hands are in immaculate condition. The scratch-resistant sapphire crystal is completely clear and defect-free.
Case & Bezel: The 40mm stainless steel case and units-per-hour engraved steel bezel display light hairline swirls under close inspection, with no deep dings, gouges, or impact marks.
Strap/Bracelet & Clasp: The stainless steel Oyster bracelet exhibits minimal stretch and remains firm, equipped with its original Fliplock clasp and full factory links.
Technical Specifications:
Reference: 16520
Case Size: 40mm
Case Material: Stainless Steel
Dial: Gloss Black with Silver Sub-Register Rings and Luminova Hour Markers
Movement: Automatic Chronograph Calibre 4030 (Base Zenith El Primero 400, heavily modified by Rolex)
Power Reserve: Approximately 52 Hours
Water Resistance: 100 Meters / 330 Feet
Notable Details: Modified 28,800 vph El Primero base; Microstella regulating screws; Breguet overcoil hairspring; screw-down pushers and Triplock crown; COSC Superlative Chronometer certified.
What Makes the Cosmograph Daytona Special:
Introduced in 1988, the reference 16520 marked a historical turning point for the Daytona lineage, replacing the manual-wind Valjoux-powered models with Rolex’s first automatic chronograph. To power this landmark release, Rolex selected the legendary Zenith El Primero movement, modifying over 50% of its components to meet its strict standards. Rolex reduced the beat rate from 36,000 vph to 28,800 vph to extend component longevity, added a Microstella balance wheel, and fitted a Breguet hairspring, creating the revered Calibre 4030.
Beyond its mechanical significance, the ref. 16520 established the modern aesthetic framework of the 40mm Oyster case, introducing crown guards, a sapphire crystal, and bold high-contrast sub-register rings. Produced for just twelve years until 2000, "Zenith" Daytonas have become highly sought-after collector pieces that bridge vintage mechanical character with modern everyday wearability.
As a U-serial from 1998, this piece features tritium material and solid end link (SEL) compatibility, making it one of the most reliable and wearable executions of the 5-digit Zenith era. Offered with its original box, warranty paperwork, booklets, and hangtag, this example represents a collector-grade investment in one of the most important chronographs ever created.
Why Buy from Road & Wrist:
We guarantee authenticity on every watch we sell, using detailed photographs to ensure when you receive your watch, there are no surprises!
Authentication Guaranteed: Every watch undergoes rigorous verification—serial number cross-check, movement analysis, and full condition report. This timepiece is guaranteed 100% authentic, backed by our money-back guarantee.
Transparent Condition Reporting: We document every detail—both strengths and minor imperfections—so you know exactly what you're purchasing. High-quality, detailed photography is provided for every watch, ensuring no surprises and honest condition disclosure.
Secure Shipping: Your watch ships via fully insured, tracked service (e.g., FedEx Overnight) with signature required.
Post-Sale Support: We are available for servicing and maintenance, and are also happy to make suggestions for accessories (straps, winders, storage, etc…)
Watch Info:
Manufacturer: Rolex
Model: Cosmograph Daytona "Zenith"
Condition: Pre-Owned - Excellent
Reference: 16520
Year: 1998 (U-Serial)
Box: Yes
Papers: Yes
Accessories: Complete Set (Inner & Outer Presentation Boxes, Warranty Certificate, Daytona Booklet, Your Oyster Booklet, Red Hangtag, Leather Guarantee Wallet, Full Bracelet Links; minus Serialized Green Tag)
Notes: The reference 16520 Cosmograph Daytona holds legendary status as Rolex's first automatic chronograph. Powered by the iconic Calibre 4030—a heavily modified movement based on the famous Zenith El Primero ebauche—this U-serial example from 1998 represents one of the final production runs before the transition to in-house movements. Featuring a sleek black dial with contrasting silver sub-register rings and a stainless steel tachymeter bezel, this timepiece comes nearly complete as a full set (minus only the serialized green tag) in overall excellent condition.
Condition Assessment:
Overall Condition: Pre-Owned - Excellent; the timepiece retains strong, defined case geometry with thick lugs, crisp bevels, and light surface wear consistent with careful handling.
Dial, Hands, & Crystal: The gloss black dial, silver sub-register rings, luminous markers, and hands are in immaculate condition. The scratch-resistant sapphire crystal is completely clear and defect-free.
Case & Bezel: The 40mm stainless steel case and units-per-hour engraved steel bezel display light hairline swirls under close inspection, with no deep dings, gouges, or impact marks.
Strap/Bracelet & Clasp: The stainless steel Oyster bracelet exhibits minimal stretch and remains firm, equipped with its original Fliplock clasp and full factory links.
Technical Specifications:
Reference: 16520
Case Size: 40mm
Case Material: Stainless Steel
Dial: Gloss Black with Silver Sub-Register Rings and Luminova Hour Markers
Movement: Automatic Chronograph Calibre 4030 (Base Zenith El Primero 400, heavily modified by Rolex)
Power Reserve: Approximately 52 Hours
Water Resistance: 100 Meters / 330 Feet
Notable Details: Modified 28,800 vph El Primero base; Microstella regulating screws; Breguet overcoil hairspring; screw-down pushers and Triplock crown; COSC Superlative Chronometer certified.
What Makes the Cosmograph Daytona Special:
Introduced in 1988, the reference 16520 marked a historical turning point for the Daytona lineage, replacing the manual-wind Valjoux-powered models with Rolex’s first automatic chronograph. To power this landmark release, Rolex selected the legendary Zenith El Primero movement, modifying over 50% of its components to meet its strict standards. Rolex reduced the beat rate from 36,000 vph to 28,800 vph to extend component longevity, added a Microstella balance wheel, and fitted a Breguet hairspring, creating the revered Calibre 4030.
Beyond its mechanical significance, the ref. 16520 established the modern aesthetic framework of the 40mm Oyster case, introducing crown guards, a sapphire crystal, and bold high-contrast sub-register rings. Produced for just twelve years until 2000, "Zenith" Daytonas have become highly sought-after collector pieces that bridge vintage mechanical character with modern everyday wearability.
As a U-serial from 1998, this piece features tritium material and solid end link (SEL) compatibility, making it one of the most reliable and wearable executions of the 5-digit Zenith era. Offered with its original box, warranty paperwork, booklets, and hangtag, this example represents a collector-grade investment in one of the most important chronographs ever created.
Why Buy from Road & Wrist:
We guarantee authenticity on every watch we sell, using detailed photographs to ensure when you receive your watch, there are no surprises!
Authentication Guaranteed: Every watch undergoes rigorous verification—serial number cross-check, movement analysis, and full condition report. This timepiece is guaranteed 100% authentic, backed by our money-back guarantee.
Transparent Condition Reporting: We document every detail—both strengths and minor imperfections—so you know exactly what you're purchasing. High-quality, detailed photography is provided for every watch, ensuring no surprises and honest condition disclosure.
Secure Shipping: Your watch ships via fully insured, tracked service (e.g., FedEx Overnight) with signature required.
Post-Sale Support: We are available for servicing and maintenance, and are also happy to make suggestions for accessories (straps, winders, storage, etc…)
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