Leda

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As you can see, Leda was a General Plastics product. As the term "leda by Beauclaire" was not on all Leda cards, I presume the brand was accquired by General Plastics.

As you can see, in 1958  Leda was a “General Plastics product”. At some stage in the 1950s the company/product was acquired by General Plastics which was in turn acquired by Beutron.

 

(Thanks to Carol for sharing her adverts.)