Saturday, October 20, 2007
In the course of decluttering, it's common to find old stamps with no postage value printed on them. The official term for these is nondenominated, and the U.S. post office has a web site listing these stamps and their value. [Thanks to fellow organizer Susan Kousek for the pointer.]
Linns.com also has this information - with nicer pictures of the stamps.
October 21 update: In the UK, non-denominated stamps are known as non-value indicators, or NVIs. But those in the UK don't need to worry about the stamps' value. As gbstamps.com points out, "When NVI’s were first introduced, stamps inscribed 1st sold for 19p. They can still be used today for that service, although the rate for first-class mail as this is written in 2004 is 28p." The new U.S. Forever stamp works the same way as British NVIs.