The Cartier Tank Obus was introduced in 1923 and has only ever been produced in extremely limited numbers. The model stands apart thanks to its distinctive case design. Unlike its rectangular Tank counterparts, the Obus features a square case with charming, bullet-shaped lugs—hence the name “Obus,” French for bullet. This rare Collection Privée Cartier Paris (CPCP) Tank Obus is crafted in 18k yellow gold and measures 26.5 × 33.5 mm. The silver dial is beautifully finished with fine guilloché engraving and features painted black Roman numerals paired with elegant blued Breguet hands. True to Cartier tradition, the winding crown is adorned with a blue sapphire cabochon. Turning the watch over reveals a display case back showcasing the manual-winding movement, with attractively finished plates decorated with Cartier’s signature interlocking double “C” motif. Fitted with a refined Bulang & Sons strap, this Tank Obus is a supremely elegant dress watch with a distinctly luxury presence. Powering the watch is the hand-wound caliber 430 C, based on a Piaget movement. It has been fully checked and regulated by our watchmaker and is ready to be enjoyed for many years to come. A true pièce de collection—sharp, rare, and unmistakably Cartier. If you’re aiming to add a little Obus to your collection, this is a shot you won’t want to miss! Specifications: Cartier Tank Obus reference 2380 Collection Privé Cartier Paris Yellow gold case 33.5x26.5mm Display case back Serial CC518xx dates to the late 1990s Silver guilloche dial with painted black Roman numerals Blued Breguet hands Blue cabochon-topped winder Comes on pictured Bulang and sons leather strap Cartier calibre 430 C manual wind movement based on a Piaget movement Fully checked by our watchmaker One-year mechanical warranty Free worldwide Fedex Priority shipping