Pearl crochet cotton no. 5 or fil d’Ecosse 10; steel crochet hook size 7.

Gauge: First two rounds are 1 3/8” high; four shells are 2” wide.

Advanced. Partial written pattern, complete chart.

Pattern 29, page 54 in Decorative Crochet.
Called “Message” in 1000 Mailles.
Called “Filigrana de arcos” in Puntorama Ganchillo #343.