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The first Callsign of mine, DO5SBZ (a novice license at the time), was not used before me as far as I am aware. Just for the records: the suffix stands for “Sowjetisch Besetzte Zone” (soviet occupied zone). A hint that I am located in east germany. Humor comes in many forms an shapes. Some of the older OM in my area got a good laugh out of it, though.
LInk to R10: https://www.darc.de/der-club/distrikte/r/ortsverbaende/10/historie/
Link to the internet archive for your own research: https://archive.org/