With painted Westwood rims and eyelets for a fender skirt, that bicycle would be older than 1960s, if it were USA manufacture. However, I'm not familair with what was happening in Sweden at the time.

The tyres are 47-622 which is a common size used on modern hybrids, so there will be no issue obtaining replacement wheels and tyres. However, I'd question replacing OEM, pinstriped rims. I'd be trying to use these rims, if at all possible.

Edit: If the rear hub is Fitchel & Sachs, it may have a date code which can be used to determine the year.