Ze środowisk bliskich producentowi:
„All parts required for the new C51 caliber, such as plates, wheels, pinions, etc. are produced in Barbing. It has never been a secret that the base plate is from the 7750, all other parts are made in Barbing.”
I podsumowanie użytkownika Lemon328i z forum WUS:
„The C51 isn't a mild mod of the 7750, but more than half the components are different. Since it wasn't built to be a central minutes chrono, Konrad Damasko's deep experience with the 7750 allowed him and his team to reengineer the movement replacing more than 1/2 the components so that the torque of stopping and starting the chrono didn't adversely affect timekeeping or the running time. Since they have patented their system and I don't belive others have (like Sinn's SZ01 or Tutima's 521, etc) it must be substantially different from the 7750.“
Wole podejście IWC, które korzystając z ebauche V7750 zmieniało płytę bazową i nie było znaków ETA - mimo, iż wiadomo było na czym mechanizm w Portugieserze bazuje.