Blancpain Fifty Fathoms Aqualung N Vintage Fifty Fathoms Aqualung NO RADIATION Circa 1966 36MM (30571)

30571 Blancpain Vintage Fifty Fathoms Aqualung NO RADIATION, unpolished stainless steel case is in excellent condition with original sharp edges and bevels, automatic Blancpain caliber AS movement, original tritium dial and hands with nicely matching patina, "No Radiation" symbol at 6 o'clock to signify Radium was not used, glossy black dial, date at 3 o'clock, original Bakelite bezel with luminous markers every 5 minutes, diameter: 36mm, thickness: 13.5mm, Rare Example in Excellent Condition.


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More about Blancpain Fifty Fathoms Aqualung N Vintage Fifty Fathoms Aqualung NO RADIATION Circa 1966 36MM

This is a vintage c. 1965 stainless steel Blancpain Fifty Fathoms Aqualung NO RADIATION. It has a shell Cordovan leather strap with a steel tang buckle, an acrylic crystal, and a screwed-down solid case back and winding crown. The 36mm diameter case, reeded bi-directional rotating bezel, and downturned lugs are un-polished in excellent condition with the original sharp edges. The graduated black Bakelite bezel has Arabic numeral markers for dive times. There is a glossy black dial with Tritium-coated Arabic hour markers at 6, 9, and 12 o'clock, rounded baton indexes, and the original Tritium baton hands, all with the original, matching patina. There is a center sweep second hand with an arrow tip, and an outer minute/second track. Radium was not used for luminescence on the civilian Fifty Fathoms, hence the No Radiation symbol is at the 6 o'clock position. The date aperture is at 3 o'clock, and it's water resistant to 1000 feet. The 13.5mm thick case, dial, and movement are all signed. The automatic self-winding Blancpain caliber 12 movement is signed Blancpain-Rayville SA. It's rhodium plated, and constructed with 17 jewels, a straight-line lever escapement, a monometallic balance, and a shock-absorber mechanism. It has a self-compensating flat balance spring, an index regulator, and an anti-magnetic cap.

In 1952, the French "Nageuers de combat" (combat swimmers) was formed as an elite team - the NAVY Seals of France. The Fifty Fathoms watch was designed for military use and low light military situations, especially diving. Blanpain used radioactive materials such as Promethium 147 to illuminate the watch dials. To separate the civilian watches from the military that were radioactive, Blancpain moved to using Tritium, marked with the triple triangle red and yellow radiation logo beginning in 1965.