2018 marks the 25th year anniversary since the first SeaMaster Diver 300 was introduced. The 42mm case is a mixture of materials; tantalum as the base metal of the bezel and the middle links of the bracelet. Other materials include grade 2 titanium for the case and contrasting links in the bracelet. Another material is Omega’s proprietary 18k Sedna Gold on the crown, bezel ring, helium escape valve and the hands. Automatic Omega’s Master Coaxial movement Caliber Master Chronometer 8806. This movement that is certified by the Swiss Federal Institute of Metrology – METAS. Anti-magnetic to 15,000 gauss. Power reserve at 55hours. Limited to 2500pcs. Priced at 12,000.00CHF