Canada #1265avar 39c Multicoloured, Norman Bethune, 1990 Norman Bethune Issue a VFNH Block Showing Significant Printing Shift

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A well centered se-tenant block of 4 of the 39c multicoloured stamps from the 1990 Norman Bethune Issue, showing a 1 mm upward shift of the black intaglio printing, which causes many of Bethune's features to appear double. Included for comparison is a normal pair, and both are on dull fluorescent Peterborough paper. This is the first example of this that I have encountered: all the pairs and blocks I have examined in the past have had normal printing. 

Unitrade does not list this printing shift, but my estimate of the value of this block is $40 ($10 per stamp).  The block offered here grades between 80 as follows:

Centering/margins: 50/70
Paper freshness: 5/5 
Colour: 5/5 
Impression: 5/5 
Absence of visible paper flaws: 5/5

Perforations: 10/10