One-Timers is a regular BTLM feature looking at clubs from around the continent who scaled the heights of European competition qualification once and once only. Today we offer you two for the price of one as the stories of our featured clubs have too many parallels to be treated separately. Both clubs were, nominally at least, German, both had the rare privilege of being part of the very first European Cup field in 1955, both were eliminated in the opening round of…