https://blog.wongcw.com/2021/06/09/%e5%85%a8%e7%90%83%e6%9c%80%e8%b2%b4%e9%83%b5%e7%a5%a8%e8%a2%ab%e6%8b%8d%e5%87%ba830%e8%90%ac%e7%be%8e%e5%85%83%ef%bc%9a%e6%9c%80%e5%88%9d%e5%83%b9%e5%80%bc%e5%83%851%e7%be%8e%e5%88%86/
全球最貴郵票被拍出830萬美元:最初價值僅1美分