Canadian Seaway Invert
About Canadian Seaway Invert
A famous Canadian error stamp commemorating the opening of the St. Lawrence Seaway. Featured the Seaway map with the center inverted. About 200 inverted copies exist. The error was caused by sheets being rotated between printing passes. The Seaway Invert is the most famous Canadian stamp error. Inverted copies sell for over 10,000 dollars. The regular version is common and worth face value. The error was discovered by collectors shortly after release.
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