Comment by W.B.lbl:
Unlike the 78 RPM {Images #3505035 & 3505036} label, Bert-Co's 45 labels for this used the rainbow mobius strip with audio logo and label name in multi-colors, suggesting this printer did not have the 78 RPM version of the label design - unlike Queens Litho ({Images #417723 & 417724}) or Co-Service Printing ({Images #2969152 & 2969153}). It did not necessarily mean Bert-Co's label type was a first variant. Proof is on
this release which labels also bear Bert-Co's typographical handiwork but which did use that design as on the other variants here.