All I know is that it is an Australian label. It is not listed in Miller [M].  Also not listed in Miller [J] hence no Austraalian jazz recorded on the label. 

Records in collection:

L033 sc3 MELODIANA   Made in Australia
MR1018 (S5637).  MR TONY POLCA (Bortoli).  Egidio Bortoli and His Orchestra. 
MR1018 (S5640).  DONNE, VINO E CANTO (J.Strauss)  Ibid. 

L003 sc3  MELODIANA  Made in Australia
MR1008 (S4713).  ESTUDIANTINA  (Waldteufel)  Waltz. Egidio Bortoli, piano accordion, with guitar and bass. 
MR1008 (S4712).  FREE AND EASY  (Porschmann)  Ibid.
Note: This record label is gold text on red-brown label.