https://aviation-safety.net/database...?id=19670604-0
From the above report, both the Approach Radar and PAR Controllers were involved. Approach was vectoring the aircraft for the ILS, but evidently PAR was also monitoring the aircraft.
At 09:07:35 the pilot-in-command requested his position and was told 7,5 miles to run to touchdown. Half a minute later the controller repeated that he had no radar contact, and cleared the flight for landing, the surface wind being 270°/12 kt.
At this stage the PAR controller, who had overheard that the Approach controller had lost radar contact, saw a contact at the bottom of his elevation display, and told the flight that it was 6 miles from touchdown.