I was out diving this past weekend with one of the most iconic 1970s setups ever: ScubaPro Mk VII, Pilot and R109. The water was 44 F, and the Pilot breaths like nothing else, easy, just so easy.
Such a shame that the best breathing SH was/is such a mechanical trophy wife: high maintenance goes with high performance.
Here are some pics of the regulator. Later this spring, Greg Barlow and I will be diving SP pilots together, others are welcome to bring their pilots and join us.