The original Korona K1-3 was 44 mm, only the bezel was scalloped, and they were indeed sold out some time ago (end of 2008 I think). The current version, with the (imho better looking by far) 'fully scalloped' case, is 42 mm, and the precious metal versions are just Korona RG/WG, while the steel ones seem to still have the K1/K3 designator. Although, apparently, the only current K3 is the Harvest Moon edition.