Cartier Tank Obus 18kt Yellow Gold Ref 1630The Cartier Tank has been around for over close over a century now, with several variations including the Tank Obus. The name Obus comes from the French for bullet and is demonstrated by the bullet shaped lugs! The watch houses a creamy silver dial with black Roman numerals with railroad track, blued Breguet hands and a blue stone cabochon topped setting crown. The dial and case are both in superb condition with the dial having the secret Cartier