For sale is a like-new Serica Ref. 5303-2. This antimagnetic diver's chronometer in the elegant "Porcelain White" finish comes as a full set, including original box and papers. The watch was purchased in March 2025 and is still covered by the international manufacturer's warranty until March 2027. The watch has only been worn a few times for testing purposes; otherwise, it has been stored exclusively in its box. The watch is therefore in excellent condition overall. The only flaw is a small dent in the lug (see photo). The watch was inspected by Serica, and the movement is technically flawless (service record included). Otherwise, the watch can only be described as absolutely like new; I cannot see any other signs of wear or scratches. The 5303 offered here is the current version with official Swiss COSC certification, a white enamel dial, and the ingenious Bonklip Milanese steel bracelet. The Swiss automatic movement, the Soprod M100 COSC, runs within chronometer specifications for me. A special feature: Serica has incorporated an internal soft iron cage into this model. This reliably protects the movement from strong magnetic fields of up to 50,000 A/m (625 Gauss). This exceeds the current Swiss standard by more than ten times! The 5303 is water-resistant to 300 m (30 ATM) (I have never tested this; the watch has never been exposed to water). Thanks to the generously sized, screw-down crown, setting the time is effortless, even with gloves on. Here's an overview of the technical specifications: Movement: Soprod M100 COSC automatic caliber with Geneva stripes 25 jewels 28,800 vibrations per hour 42-hour power reserve Shock-resistant Chronometer-grade accuracy (-4/+6 seconds/day) Case: 316 stainless steel, alternately polished and satin-finished Double-domed sapphire crystal, anti-reflective coating Soft iron cage (anti-magnetic up to 50,000 A/m) Water resistance: 300 m (30 ATM) Ceramic bezel with double graduation, black enamel White enamel dial, domed indices with Super-LumiNova C3 Black lacquered hands with Super-LumiNova C3 8 mm screw-down crown Dimensions: Case diameter: 39 mm Height: 12.2 mm mm Lug width: 20 mm Included in delivery: Serica Ref. 5303-2 Serica Milanese strap with Bonklip clasp (standard version) Original box Warranty certificate COSC certificate Purchase and service invoices Hang tag