14K White Gold case in the Cut Corner Tonneau shape with Sapphire crown.
Band is 14K White Gold filled Filagree band.
Both Case and Movement Stamped Date Code is for 1927.
There is a theory or belief that this case shape (CCT) is uniquely identified by this case shape and exclusively exists in only one model: Ramona, (6722) which changes names to Romola, Corinthia, and then the Lenore. The Mermaid ad has been in the 1920's partial ads section since Oct/2012 and was not factored into this theory, and has the same CCT shape.
With all due respect and my research, IMHO believe that this theory is not plausible and that there is at least 2, possible 3 or 4 different names with this case shape (CCT), each having their own distinct design.
The name change in 1930 to Lenore can not be correct if the Lenore was and advertised in a completely diffferent case shape from 1924 thru 1930/31. Therefore, the Dec 30, 1930 ad from Saturday Evening Post has mistakenly put the wrong name on the wrong watch. In an ad dated Oct. 1931 the Lenore did change the shape of the case into the baguette style.