Specimen Stamps

Specimen stamps are postage stamps overprinted or perforated "specimen". In earlier times a copy of every stamp issue were sent by each country to the Universal Postal Union for to be distributed to the member countries as reference stamps.

Nowadays issued more for marketing purposes.

Specimen stamps is a specialized field of stamp collecting. As a growing number of postal administrations issue specimen stamps they have today also became popular for stamp collecting by country and by topic.