deBoulle Diamond & Jewelry

Blancpain Fifty Fathoms 70th Anniversary Act 3 5901 5630 NANA

SKU: 5901 5630 NANA
deBoulle Diamond & Jewelry

Blancpain Fifty Fathoms 70th Anniversary Act 3 5901 5630 NANA

SKU: 5901 5630 NANA
Sale price $35,900.00Regular price $0.00
Regular price $35,900.00
The Fifty Fathoms 70th Anniversary Act 3 is a striking tribute to one of Blancpain’s most historically significant dive watches. Inspired by the original MIL-SPEC model issued to military forces in the 1950s, this limited edition reimagines the past with modern craftsmanship and enduring materials. Only 555 pieces were produced, each evoking the legacy of underwater exploration with purpose and precision. At the heart of this 41.3 mm timepiece is a case forged from Blancpain’s proprietary 9K Bronze Gold—a warm-toned alloy that blends gold, copper, silver, palladium, and gallium to create a vintage aesthetic with contemporary resistance to oxidation and skin reaction. The black Dial features a functional moisture indicator, just like the original military version, alongside a satin-brushed unidirectional bezel with a black ceramic insert and vintage-colored Super-LumiNova® markers for legibility in low light and deep water. With 300 meters of water resistance, it’s built for the challenges of professional diving. Inside beats the Caliber 1154.P2, an automatic movement that offers a 100-hour power reserve and resistance to magnetic fields up to 1,000 Gauss, thanks to its silicon balance spring and non-ferrous components. The sapphire case back reveals the beautifully finished movement, a reminder of Blancpain’s mechanical artistry. Completing the look is a black NATO strap made from recycled fishing nets, emphasizing the brand’s commitment to sustainable ocean stewardship. This is not just a dive watch—it’s a chapter in diving history, reborn.

Care & Maintenance

Clean regularly with a soft cloth. Avoid exposure to chemicals, extreme temperatures, and magnetic fields. Store in a safe, dry location when not in use.
Mechanical watches should be serviced every 3-5 years by a certified watchmaker to ensure optimal performance and longevity.
Water resistance varies by model. Check your watch's specifications and avoid exposing non-water-resistant timepieces to moisture.
Contact our service department immediately. Avoid attempting repairs yourself, as this may void your warranty and cause additional damage.
Wind gently and consistently. Stop when you feel resistance to avoid over-winding. Automatic watches wind through wrist movement during regular wear.
Minor time variations are normal. Mechanical watches typically vary ±15-30 seconds per day. If variation exceeds this range, professional adjustment may be needed.
Most watches allow date adjustment, but avoid changing the date between 9 PM and 3 AM when the date mechanism is actively changing to prevent damage.
Warranty terms vary by manufacturer and model. Contact us for specific warranty information and to understand what is covered under your timepiece's warranty.

Your deBoulle order will arrive securely via courier, requiring an adult's signature and ID upon delivery. Currently, we can't offer specific time slots, but you'll receive tracking details and estimated delivery dates via email. Delivery within the United States is complimentary. Items are discreetly packaged in branded deBoulle boxes with unmarked external packaging for security. If missed, deliveries can be rescheduled through our Ambassador or courier directly. You can also opt for in-store collection at our Dallas or Houston locations, where you or an authorized individual can pick up your order with proper identification and order confirmation.

Returns or exchanges of your online order can be made within 30 days, either by contacting a deBoulle Ambassador to arrange complimentary online collection or by visiting our Dallas or Houston stores. All returns and exchanges require items to pass a quality control inspection, and refunds typically appear within 10 business days. Customized, bespoke, engraved, or preowned timepieces cannot be returned or exchanged. Gift recipients may return or exchange items, though refunds will be credited to the original purchaser. Items must be unworn, pristine, and include original packaging and certificates.

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