Welcome, Looks to me like Lemania CH 27, or Omega 320, this upload from Dr. Roland Ranfft's movement archive will give you some information. If you have more questions, please return. http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Lemania_CH27 Here is an upload from the same source for Omega 320. http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Omega_320