Well...

Seeing now that the year of construction for the hill is given as the 1950's, Undis Blikken's jumps of 23.5 and 27 m on the same day in 1931 must have been done on an earlier version of the hill. But I have seen men's hill records here as far back as 1921.

Hill records

After the hill was rebuilt around 1971-72, Arnfinn Kalfoss (Norway) set a hill record of 42.5 m on 17 March 1973.

There is also a possible women's record. Undis Blikken (Norway), who later became known as a speed skater, jumped 27 m on 22 March 1931.