Canada 1991 $2 Truro Provincial School error, SG1480abCanada 1991 (error discovered in 1994) $2 Provincial Normal School, Truro (perforations 13 x 13) , SG1480ab Dark Turquoise Blue Omitted A rare and striking modern Canadian error with strong visual contrast. A Post Office fresh unmounted mint marginal example, showing the error of dark turquoise blue omitted. This major colour omission results in the loss of "CANADA $2" and significantly alters the appearance of the buildings roof and architectural