Decca (UK): Broad band label.
The "broad band" refers to the horizontal "full frequency stereophonic sound", and is used by collectors to identify recordings which were mastered using cutting lathes powered by valve amplifiers. These are generally regarded as the best of analogue sound, and some of the best sounding early stereo recordings appeared under this label. Recordings of the Swiss Romande Orchestra conducted by Ernest Ansermet are particularly prized.
This one was issued in 1958, the year in which stereo recordings became generally available.