The style of engraving is known as Corombelle, named after engraver Hyppolite Corombelle.

http://www.engravingglossary.com/Hand%20Engraving%20Glossary%20C.htm

Roger


C. Roger Bleile
Author of American Engravers-The 21st Century
FEGA Historian
www.engravingglossary.com