This is an Omega 30T2 jumbo that's been fully serviced. It's a clearance item at a clearance price! The dial has been refurbished (not particularly well) and I suspect the case has been replated (again, not particularly well). That said, it's a fully serviced genuine 30T2 Omega calibre and it's a 38mm jumbo case.
1944 Omega 30T2 Jumbo
Year 1944-1946 Case Metal Stainless steel Back Metal Stainless steel Back Type Snap Diameter* 38.2 Length** 45.33 Power Manual Calibre 30T2
*mm excluding the crown
**mm tip of lug to tip of lug