Jeff,
There are two basic types or classes of repeaters. The terminology for these notes is not standardized
but the term "Class" is used quite often:
Class A (frequency of 1:10000) ABCABCA
Class B (frequency of 1:1000) ABCxABC (where x can be any number)
Here is a link to a recent thread discussing repeaters:
http://www.cdnpapermoney.com/forum/index.php?topic=4865.0The new 20th Edition catalogue will finally be recognizing these serial numbered notes and listing them in
the Special Serial Numbers section at the back of the book.
Here is an excerpt from the Charlton Press website on the new catalogue:
The hobby continues to grow in popularity, with new collectors joining the ranks and looking for nontraditional ways to collect.
In this regard, notes with repeater serial numbers are receiving attention, and have been recognized in the special numbers
section of the catalogue.
Information about the Charlton 20th Edition Catalogue:
http://www.charltonpress.com/NumismaticsBook.asp?v_ISBN=9780889683044...Arthur
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Arthur Richards
Contributor, Charlton Catalogue of Canadian Government Paper Money, 19th, 20th, 21st, 22nd and 29th Edition
Pricing Panel Member, Charlton Catalogue of Canadian Government Paper Money, 21st Edition 2009