I believe this was the first version of Connect. The pieces are roughly 48mm square.

The Connect game was commissioned by Galt Toys in 1969. Ken Garland and his team spent a lot of time testing the games with families to get it right. This concept was new to Galt, who traditionally just produced games and would then move forward with whatever games sold well. During testing, it was discovered that the game could end in a tie if two children had the same amount of cards left over. One child suggested that in this case, the younger one should be declared the winner – and that made it into the rules.