It was good to find this thread - I'm a bit surprised it's been dormant, given what wonderful watches these are. I couldn't agree more with what has been said already: superb build, with a certain pleasing heft on the wrist; one of the greatest of all blue dials; usually with that powerful "Pellaton" movement. Although it just bespeaks discreet wealth, less common (in all senses) than a DJ, it's thankfully less in demand and hence less expensive.
Serial numbers on mine suggest 1975 manufacture, and I am fortunate to have b & p for it, so I know it was retailed in Zurich in early 1976, which seems corroborative. I wish my photo set-up were better, but anyway here are some shots.
Always a pleasure wearing it - size, weight, proportions. The blue dial returns the light all the way from petrol to navy. And it keeps great time.
This is IWC's Ref.10 bracelet, well engineered and really comfortable.
Movement is Cal 8541B, the final evolution of the original Pellaton, also used in the Ingenieur (but again, for less money). One of the great sights in watches...
...including without the rotor.
I hope we can see more of these on here!