This company was registered in December 1954. Previously registered names of the company now trading as Bertram Pacific Pty. Ltd. include Walkers Fashion Accessories, E. Walker & Son, Walkers BHS, and Bertram fabrics) Therefore I presume that tubes and cards of ‘Walkers’ buttons are from this company. That in turn suggests ‘Delphi’ was part of, or was merged into, this company as cards exist of both Walkers and Delphi buttons described as ‘A Delphi Product’.
The box below shows that Delphi was merged into the Beauclaire line of buttons. The name ‘Delphi’ was phased out but ‘Walkers’ continued into circa the late 1960’s, (presumably used by Beutron who bought out Beauclaire in 1957). E.Walker & Son were distributors of Korbond products in they 1950’s. The buttons on their cards below were probably distributed rather than produced by the company.