This is Robin pattern no. 523 which I think dates to the early 1950s.
Instructions to crochet two gorgeous lady's hats:
cap bonnet (trimmed flowers)
square hat (petal border)
Both crocheted in double knitting.
The pattern has rubbing to edges and corners, and creasing from handling, including a crease from where the pattern has been folded in half horizontally. Tad grubby at back. All instructions are clear.