Ever since I bought my tudor snowflake Ci, I am very interested in these watches. Like you I did a lot of research and managed to build a database that now has 32 examples. Most of them are ref 7928, 2 ref 7016 and 3 ref 9411. Unfortunately, not all data is complete. Mine btw is a ref 7016 snowflake. Anyway, I have been reading this thread and especially your thoughts with much interest. Most interesting indeed.