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Is that page ranking or is that page indexed? Because sometimes can happen you have a link in a page that Google has not indexed (that happens in case of directories, sometimes). Then, with the Mozbar, check the metrics of that page and of its domain. mozRank value corresponds almost to the real PR of the page and DomainRank and DomainTrust metrics can tell you if it is an authoritative site. If the metrics are good at least on a domain level, then be happy, because you have obtained naturally a link from a new unique domain name which has good/excellent domain metrics that helps yours domain metrics as well (especially the domainTrust one). This is the case of being linked in an internal article of the New York Times, for instance.