Something I noticed about both stamps on the envelope are the die-cut Swedish Post logo. It's hard to see but it's there. This is the first time I've seen this on a Swedish stamp. It's a security feature that is suppose to prevent you from peeling the stamp from the envelope and reusing it. I was able to peel quite a bit of each stamp from the envelope and the die-cut parts did not remain on the envelope so the stamps remained intact.