The Treskilling Yellow stamp was sold for $2.6m in 2010 - Sweden most expensive stamp 

See ‘Sources’, if you are interested in purchasing Swedish stamps.
N.B.: If have some old stamps at home, but want to appraise them, here is a good article from Warwick & Warwick on “How to appraise stamps”: bit.ly/3a36RCS
Sources:
1). findyourstamps...
2). www.northstamp....
3). www.stampworld...
If you want to learn more on how to grade and value stamps, consider these resources:
www.warwickand...
findyourstamps...
www.philatelic...
Music:
Fresh Fallen Snow - Chris Haugen
Lost In Prayer - Doug Maxwell
Disclaimer
The accuracy of this video is based on the data collected at the time available and the date this video was published. If the video is old (more than six months), then, new data might have come out. By the way, all data sources are found in the description below. Hope you enjoy this video!