I bought this one not knowing the date code or serial # and thought it was Ramona. After reading the threads on the Ramonas in the DB I do not think so. Although I found ads for Ramona as late as 1931 it would seem this one is a Corinthia. The date, case etching, and dial seem to fit it best.
Here is a little run down on this model and like models from another thread: Earliest model called 6722, then Ramona but subsequently went though several name changes, Romola 1928, then Corinthia 1929, then Lenore 1930. Between the Romola and Corinthia the Corinthia dial seems to match this watch.
The case is 14k gold filled with a 1928 serial #. The movement is a working 15 jewel 6AP with a 1929 date stamp. I installed a filigree band that seems to match the 1929 models well. Let me know if I missed anything or if you agree.