The Rondo label is one of (at least) three labels, which were distributed and/or manufactured by Phonocolor GmbH. Except for Topas these were Topas and Okay (2).
Phonocolor was also known for many, mainly Flexi-disc, recordings for advertisement like Servas or recordings without label.
Rondo and Okay (2) were further divided in series, which coexisted either as plain label or with the line 'Spezial' and 'Exquisit'.
For Okay this were Okay, Okay Spezial and Okay Exquisit, for Rondo Rondo, Rondo Spezial and Rondo Exquisit.
All these six "sublabels" shared the catalogue numbers, means catalogue numbers are only consistent, when both labels are summarized.