Outstanding job!     "But there are several operations to transform it like that: shaving of the rear side, cutting of the groove and shaping of the case back seat."   For anyone needing to tell at a glance if a 1016 case is genuine (or a very good copy), look for the slight groove around the case where the case back seats as noted by Rolojack.  Since it is hard to duplicate, not many replicas or Frankensteins will have it.  No guarantees though.     Here