The design started with General Plastics (Beauclaire) around 1950 and was still being used by Beutron in the 1970s.
The strip is c.1963 and the card 1966-67.
The card on the left is a strange one: the printing is thicker, the card slightly smaller and the buttons are stapled on. Although this method of attachment was commonly used in America in the 1940-50s, it was not popular in Australia, only appearing on a few Embassy cards around 1966-68 and Big W cards in the early 1970s. The staples are a nuisance to remove when you want to use a button, and go rusty on stored cards. I’m guessing the customer feedback prompted a return to sewing the buttons on.
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