A masterful blend of fine watchmaking and diving precision, the Blancpain Bathyscaphe Chronographe Flyback 5200-3640-NAOA brings a bold yet elegant presence to the Fifty Fathoms collection. This exceptional timepiece is crafted in sedna gold, an exclusive rose gold alloy enhanced with palladium and copper for long-lasting warmth, color stability, and corrosion resistance. At 43.6mm, the case maintains a commanding wrist presence while retaining the clean, functional lines that define the Bathyscaphe aesthetic. The dial is finished in a rich sunburst blue, catching the light with subtle radiance and echoing the deep hues of the ocean. It features three recessed chronograph subdials, a discreet date window between 4 and 5 o’clock, and Super-LumiNova® hands and hour markers to ensure optimal readability in all conditions, from boardroom to seabed. The dial is framed by a unidirectional blue ceramic bezel filled with Liquidmetal®, an innovative, scratch-resistant alloy that ensures both aesthetic sharpness and functional durability. Powering the watch is the sophisticated Blancpain Caliber F385, an in-house automatic flyback chronograph movement beating at 5 Hz (36,000 vibrations per hour). This high-frequency movement allows for precise timekeeping and supports flyback functionality, enabling the chronograph to reset and restart instantly with a single push of the button. It incorporates a column wheel and vertical clutch for smooth chronograph engagement and long-term mechanical reliability. The movement is showcased through the sapphire crystal caseback, revealing fine finishing, Geneva stripes, and a gold rotor engraved with the Blancpain logo. Completing the timepiece is a blue NATO strap, which gives it a sport-luxury edge while offering lightweight comfort and secure wear during high activity. With 300 meters of water resistance, this model stays true to its Fifty Fathoms lineage as a robust, fully capable diving instrument. The Blancpain Bathyscaphe Chronographe Flyback in sedna gold is a watch that seamlessly merges heritage and innovation — equally suited for adventure, elegance, and everyday wear.

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.