The Omega Suverän reference CK 2400 is a special model produced by Omega for the Swedish market during the 1940s. Introduced around 1942, this watch was part of an initiative by the Swedish government to support the national economy during World War II; the watches were purchased from Omega and sold to Swedish citizens with a markup. The CK 2400 features a 35mm stainless steel case with a screw-in caseback and 18mm lugs. It is powered by the manual-winding Caliber 30T2 PC AM. This model was available with several dial variations, including black, grey, white, and two-tone, with Arabic or Roman numeral indexes.