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Do Swedish dollars expire or something?
I literally don’t know what our money look like. I have a vague memory that the 20 krona bill was blue, but beyond that I don’t know.
My final question in that comment is very sarcastic. I know absolutely nothing about Swedish money but I can guarantee you that it does not expire.
Assuming you’re serious, and you have no idea what your own currency looks like, could you not just go to a bank and make a withdrawal in cash and keep it somewhere safe? You don’t really need to know what it looks like as long as you get it from a trusted source.