History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Games & Quizzes Videos Today in History Dictionary History & Society

History
Philosophy & Religion
Politics, Law & Government
Society & Social Issues

Health & Medicine
Science
Technology

Browse Biographies

Animals & Nature

Birds, Reptiles & Other Vertebrates
Environment
Fossils & Geologic Time
Insects & Other Invertebrates
Mammals
Plants

Geography & Travel

Geography & Travel

Entertainment & Pop Culture
Literature
Sports & Recreation
Visual Arts

Image Galleries Podcasts Summaries Top Questions Britannica Kids

Personal Finance

Finance & the Economy

About Us Privacy Policy Terms & Conditions

© 2026 Encyclopædia Britannica, Inc.

Britannica Money

David Grenville John Sellwood | Britannica Money

David Grenville John Sellwood

Principal Lecturer in Mechanical Engineering, Kingston Polytechnic, England. Author of An Introduction to the Coinage of Parthia.

Recent Articles

Finance & the Economy

coin