Ok... well, as aforementioned, there are in fact some 9+ different models sporting the same bezel opening, and I just found another vintage ad among several received that includes the 1948 "Chief," model... It of course only mentions the name, but it looks just like a Clinton, or Knickerbocker! And as aforementioned, there is also another "Director" model, and a "Rockland," that one or the other may well be just as similar?! So, after since also looking briefly at movements (not my area of interest, frankly) it would appear that the 1941 dating for the Knickerbocker is then likely correct... and the Clinton was released in 1946, then apparently the Chief model, in 1948... (I'll add a cropped photo of the Chief illustration, from the 1948 Saturday Evening post display ad, as well...) I suspect, as par... that it ultimately comes down to making variants of a "good seller." This case syle was obviously quite popular, so the 1946 "Clinton" was a new name for the "Knicker," with a change of movement... And therefore in 1948 I suspect the movment was again changed, for the rename to the "Chief?"
As for the other five that take the same glass window, I suspect that several more will surface here shortly... and that's why I posted all this, on the "Knickerbocker" thread! (Apologies, Murray :-)
My Best :-) William