As a tip to the Nordic readers of the forum: There is a guy in Sweden specialized in sharpening scissors. Have myself sent two old finds to him with excellent results.
He takes them apart, sharpens and polishes the blades (without going full on total restoration, just functional) - back in original but vastly improved condition. Factoring in the costs of postage, we are not talking lots of money for the service.
http://www.harald-slipservice.se/
(https://i.postimg.cc/CRThg1dJ/DSC-1726.jpg) (https://postimg.cc/CRThg1dJ)