Spotted this old newspaper cutting (apparently dated Jan 29th 1999, but based on further information, likely 1979) on a recent visit to the Lecht.
This specific S61 does not appear to have a bubble window or a mirror fitted, so I can only assume placement was made by some means other than direct pilot vision.
Interesting to see the quoted section weight at 1,600lb (~725kg) - seems a light load given the lift capability of the S61, making the choice of machine all the more intriguing!