Omega Constellation Calendar Chronometer – Cal. 504 – Circa 1958 – Restored Dial – In-House Serviced An elegant vintage Omega Constellation Calendar Automatic Chronometer from the late 1950s, featuring a beautifully restored silver sunburst dial, a classic stainless steel case and Omega's renowned automatic Calibre 504. This distinctive timepiece represents the golden era of Swiss chronometer watchmaking, combining timeless design, elegant proportions and exceptional mechanical craftsmanship. Dial & Case The watch features a professionally restored silver sunburst dial in excellent visual condition, carefully refinished to preserve the classic appearance of the original design. Applied silver-tone hour markers, elegant dauphine hands, the signature Constellation star and a framed date window at 3 o'clock create a beautifully balanced and sophisticated appearance. The stainless steel case is preserved in very good vintage condition, with attractive polished surfaces, elegant curved lugs and well-defined proportions. The Omega-signed crown completes its classic design. Movement & Service Inside is the distinguished Omega Calibre 504, a Swiss-made automatic chronometer movement featuring 24 jewels and a date complication. The movement has undergone professional in-house servicing by watchmaker, including careful mechanical inspection and maintenance. Important Information About the Case Back For complete transparency, please note that the case back was replaced at some point in the watch's history with an original Omega Seamaster case back, bearing reference 2849-9 SC. The watch itself is an Omega Constellation Calendar, featuring the correct model designation on the dial and the Omega Calibre 504 automatic chronometer movement. The Constellation Calendar case design corresponds most closely to the Omega CK 2943 reference family. This case-back replacement is disclosed to ensure full transparency and avoid any misunderstanding regarding the watch's configuration. Watch Details Brand: Omega Model: Constellation Calendar Automatic Chronometer Period: Late 1950s, circa 1958 Movement: Omega Calibre 504, automatic chronometer Jewels: 24 Case: Stainless steel Dial: Professionally restored silver sunburst dial Crown: Omega-signed Current case back: Original Omega Seamaster, ref. 2849-9 SC Service: Professionally serviced in-house Dimensions Diameter without crown: 35 mm Diameter including crown: 37 mm Lug-to-lug: 44 mm Thickness: 12.5 mm Lug width: 18 mm Strap The watch is fitted with an elegant black genuine leather strap and an aftermarket buckle, complementing its classic stainless steel case and silver dial. Overall Condition A beautifully presented vintage Omega Constellation Calendar, distinguished by its professionally restored dial, attractive stainless steel case and the celebrated Calibre 504 automatic chronometer movement. The watch offers the refined appearance of a classic 1950s Constellation, with the added reassurance of a recent professional service carried out in our own workshop. An appealing vintage Omega for enthusiasts who appreciate traditional Swiss watchmaking, elegant design and a carefully maintained mechanical timepiece. Please examine all photographs carefully, as they form an integral part of the description and accurately illustrate the watch's condition and configuration. Tracked and insured shipping 30 EUR ( European Union ) 50 EUR ( Worldwide )