Last one I flew was landing at Keflavik - BIKF... early 1980s..
Was with a 707-320B, under FAR 121, PAR was listed in our Ops. Specs...
Courtesy of US Navy... minimums were 200-1/2...
We saw the runway coming close to minimums, perfectly aligned and on glide path.
They claimed to be able to talk a plane down with zero/zero conditions...
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If I recall well, "they" often offered to give you a PAR...
To give them practice, they too needed to stay current...
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Happy contrails