B. HISTORY of the Model: In 1933, Rolex developed and released the world's first waterproof self-winding watch. The model is called a bubble back as a nickname in the United States. The bubble back is actually the Oyster Perpetual, but since the self-winding unit was layered on the hand-wound movement, the thickness increased inevitably, and the conventional back cover could not be used. . Therefore, Rolex developed a back cover with a bulge and thickness like a bubble. It has been active since its release in 1933 until around 1955, and because of its unique shape, it is still extremely popular with Rolex fans. The Rolex 3133 is a vintage "Bubbleback" Oyster Perpetual model produced in the 1940s and 1950s, notable for its self-winding movement and small, domed caseback. These watches were known for being the "hottest" models in their time and are still highly sought after by collectors, especially those in good condition. They were made with various combinations of steel, gold, and other materials and many were officially certified as chronometers. • Model: Rolex 3133, also known as the "Bubbleback". • Production: Primarily from the 1940s to 1950s. • Key Features: o Self-winding movement (Oyster Perpetual). o Distinctive, domed caseback. o Available in various materials, including stainless steel, with options for gold bezels and crowns. o Many were certified as chronometers, a mark of high accuracy, and signed as such on the dial. very fine, attractive, well-preserved, stainless steel, self winding chronometer wristwatch with pink gold bezel Brand Rolex, switzerland Model "Bubbleback" ovetto. Reference 3133 Year circa 1940's Case steel. not sure if polished, could be a bit. Bracelet  leather. Diameter 32 Caliber 9 3/4''', 17 jewels Signature dial, case and movement *Auction includes : - Watch - generic strap - Original gold plated buckle. - black strap generic. - Not original buckle. Condition: * watch is not polished. * watch has been tested and working service good condition. * I believe the seconds small hand can be replaced in red and dial looks refinished. CONDITION REPORT: subjective to me as a collector: Watch has minimal scratches in case, dial, crystal, bezel , due to being vintage. nothing to worry about. glass in good condition 9.of 10 Case9,5/10 Bezel 9,5/10 Belt/bracelet slight scratches 9,5/10 mint new bracelet. Dial in good condition 8,5/10 Buckle/buckle slight scratches 9,5/10. ......................................¬­.......................................¬­.¬............................... *We are watch collectors by heart, and passionate curators *We offer rare , different and singular watches *We take care of the watch, as if it was for us. *1 year warranty. *We ship our watches from Madrid, Spain. .......................................­¬.......................................­¬.¬............................... IMPORTANT INFORMATION: * read description carefully. * Watch is sold according European Union laws and regulations. * warranty to be covered, only if not used with watchwinders or opened the watch. * we cannot cover it if watch has not been worked by us. * we do not recommend watch winders it can magnetize the watch * Buyer has to pay taxes if buying outside the European Union. - If in Canary Islands, taxes also apply. * Photos are part of description, please watch carefully