I'll have to try and jog my memory as to where I saw the info may have been possibly been in Peters book, maybe Skennertons or Strattons, I think it may have been in Stratton's.
My rifle and scope are listed in Peters book on Page 48 no prefix for the rifle just 38***/16684 for Dowelled Bush and screw trials, but this does not fathom how I got a date still be good to learn exactly when they were paired together as a unit.