@Donko1100 These watches are of particular interest to me and there is not much information around about the early jumbos. It would be great to get an extract to confirm the reference number.
This dial and handset combo would look appropriate to a Ck 2186, but that’s not the “case” here. However it is an appropriate feel for a late 30’s early 40’s watch, I just haven't found anything like this in my collected reference materials. The nearest analog would be a ck859 but your lugs are a bit different in shape.
The flat caseback is very indicative of cases from this early time period so I think it's all original and we need to know more!
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