Brunensis is in Czechoslovakia.
I guess OP27 means Opus 27, in other words his 27th instrument.
I don't know if the luthier's name is Dilny or Kreutzer though!
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Hey, I am looking one of these basses and wonder if you may have come across any more info. Mine is dated 1997 and OPUS - B14. I am taking it to my friendly neighbourhood luthier this Sunday to see if he can help.