This medallion is pattern #34 in the book “75 Lace Crochet Motifs.” Instructions on page 70. Featured on page 25 of the showcase.

Finished diameter: 2-3/4 inches (70 mm).
Thread required: 11 yards (10 m).

All pattern samples in this book are made with size 10 thread and a size 7 (1.65 mm) crochet hook.