This Cartier Ballon Bleu W6920042 has undergone a complete professional restoration by an independent watch studio specializing in Swiss automatic calibres. The movement was reconstructed using an ETA 2892-A2 base and equipped with an authentic Cartier rotor, in full accordance with the original Cartier Calibre 049 specifications used in this model. The calibre has been fully serviced, lubricated with new oils, adjusted, and tested for precision and amplitude to meet factory standards. The case back engravings (Cartier logo, reference, and specifications) have been laser-restored using high-precision engraving equipment. The original serial number can be checked on official Cartier online database. This watch is offered with its original Cartier box and documentation. Technical details: - Brand: Cartier - Model: Ballon Bleu - Reference: W6920042 - Movement: Restored to Calibre 049 standards (ETA 2892-A2 base with authentic Cartier rotor) - Case: Stainless steel, refinished - Case back: Restored; laser-engraved inscriptions in original Cartier style - Serial number: Original, verifiable - Diameter: 42 mm - Crystal: Sapphire - Bracelet: Original stainless-steel bracelet, refinished - Condition: Professionally restored – very condition condition (some minor scratches on back case) Accessories: Original Cartier box and papers Remarks: The restoration followed Cartier Calibre 049 construction standards. The engravings on the case back were recreated by laser to factory precision. Work performed by an independent professional atelier, 1 year warranty from us. Please note: this is a customised watch, meaning it may include components that differ from the original factory specifications. Customisation can vary widely, so we highlight the following possibilities for full transparency: Aftermarket parts The watch may include third-party components (such as bezels, dials, hands, crystals or gem settings) that are not produced by the brand owner. These parts are often added for aesthetic reasons, but are not considered original by the manufacturer. Original parts from other models Some components (e.g. dials or bracelets) may have been sourced from other genuine watches by the same brand. While these parts are authentic, they were not originally fitted to this particular model or reference, which may affect collectability or eligibility for manufacturer service. Non-original parts In some cases, customised watches may include parts that are neither original nor manufactured by the brand. These components can affect the watch’s value. We ask sellers to clearly mention such elements in their object description. We encourage all bidders to carefully review the photos and description before placing a bid. Keep in mind: customised watches may not be eligible for official service or warranty from the brand. All bids should be placed with full awareness of the customisation status described above.