This seahorse is pattern #24 in the book “75 Lace Crochet Motifs.” Instructions on page 60. Featured on page 29 of the showcase.

Finished height: 2-1/4 inches (57 mm).
Thread required: 3 yards (2.7 m).

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