Safety harness

Today I was seaching for some stuff in my parts stash. While I was there I took a closer look on the safety belts I've had there for over ten years. I was quite surprised as I realised that they are actually old racing harness! I was like WOOHOO! I need to get some oldskool inspired car for these! They appear to be made in Sweden by RKN, althought there is chromed fastener that says Klippan, is says only RKN on the buckle and the badge. Unless ofcourse these two kompanies are related some how. I need to check Google.