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ATA Chapter #94

ATA Chapter #94

EFO Resources

This section is curated by the EFOCC webmaster. Each item is briefy described, so that you know what a particular reference contains before you click on a link.

Please email the webmaster if you find that a link is broken.

EFO Bibliography

Books, Booklets

Errors, Freaks and Oddities on U. S. Stamps - Questions Marks in Philately, by Dr. Stanley B. Segal
Perhaps the first book focusing on EFOs, Dr. Segal's work helped bring EFOs into the mainstream of philately. We present here a complete reproduction of the book.

100 Years of Stamp Production 1894 - 1994
A booklet issued by the Historical Resource Center of the Bureau of Engraving and Printing reprints an article that appeared in the July 1994 issue of the United States Specialist. It has a lot of information on selected stamp issues as well as many references for futher study. The details about various printing presses is particularly interesting.

Papers, Articles

Errors, Freaks and Oddities, by John Hotchner
In this authoritative essay, Hotchner provides a classification of all EFOs, reviews how they occur and how much they might be worth. This article was originally published in 2000 in the Millenium Edition of Linn's World Stamp Almanac, 6th edition.

John Hotchner's Columns from Linn's
A collection of columns John Hotchner wrote for Linn's from 1978 through 1986.

The AG Files, by Ed Silver
A series of EFO articles published between 1977 and 1983.

Articles by Wayne Youngblood

Articles by John Ryskamp on computer-vended postage.

Articles by Ken Lawrence

Other EFO-Related Articles


Exhibit on U.S. postal card errors by William Weiss.

Exhibit on forgeries by John M. Hotchner, Joann Lenz and Richard Drews.

Exhibit on U.S. bicolor postage issues of 1869, 1873 & 1901 by Don David Price.

THE JENNY - Production Variations of America's First Airmail Stamp by Don David Price.

A two part exhibit hosted by the APS on printing methods, paper types, postage stamp separation methods and EFOs that happen due to variations in those elements:
Part 1
Part 2

The Museum of Philately, maintained by David Feldman Auctioneers, contains many exhibits, including some with substantial EFO content. The quality of material is excellent. presentation is generally good, but the site is slow. Don't let this turn you off, waiting for the pages to load will well worth the wait. Even when not EFO-related. the exhibits shown are magnificent. Your webmaster liked in particular:

GREECE: Fabrication & Postal Usage of the Large Hermes Heads Paris printings, by Louis Pierre Fanchini

The rarities page is also fascinating and has information on several well-known inverts, including the price and date of the last sales as well as the stamps' provenances.


Interesting EFO Related Sites (Non-Commercial)
Interesting EFO Related Sites (Commercial)
Other Interesting Philatelic Sites

John M. Hotchner
Errors, Freaks & Oddities
The EFO Collector
The Archives
John M. Hotchner
EFO Corner
The Columns
from Linn's
Articles By
Wayne Youngblood
Computer-Vended Postage
EFO Related Websites
EFO Related Commercial Websites
Interesting Philatelic Sites
EFO Bibliography

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