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I was licensed as a HAM in June 2011 as Novice Class and got the callsign YD1CWK.
In November 2012, I have passed the General Class exams. I have upgraded my HAM license from Technical to an equivalent of General License (from YD1 to YC1) but my Suffix is remain the same CWK. If you still need QSL card from my previous call sign please contact me by email, I will be answered by YD1CWK card.