Monica Zetterlund first single 1958

I thought the days where over for new discovery´s but here´s one that suprised me just recently, apparently this one was pressed in 1958 first in the U.K. as a promo and then later the same year in Norway but then with yellow vinyl.
I can´t find any info in the books about this one therefore it must be considered extremly rare and also my guess is that not many copies could have been made of this promo.
The sound quality is way superior comparing to the norwegian press on this Monica Zetterlund first 7" record.