William, I have not really delved into watches in a few months (gulp. perhaps 6?) but, what I wrote above, I did so from memory, did it serve me correct? Jon.
Jon, Your explanation was excellent, a bit technical for the neophyte but absolutely correct. The "scafusia" is unfortunately no longer made but you are absolutely correct that it is the most reworked mvt. I guess today the IWC Grande Complication with the 7750 should replaced it as the most reworked ETA in production. William