Page is a not externally linkable
sit2510 - 8:26 am on Oct 14, 2003 (gmt 0)
The belief that link pages must be PR4 or higher to be qualified for backlinks is purely out-dated. PR4 or PR5 link pages do not necessary be shown as back links. >>> I've checked my backlinks and those of other sites. Several pages that have a PR4 or higher that have links to mine haven't shown in my backlinks for months. You may want to view the cache or count the number of links on those pages that your links are in. I believe this will help to answer your question.
IMHO but contrary to most of the people's belief over here, I think Google backlinks are pretty accurate and it conveys a simple and direct message about your links but depending upon how you interpret them...