Canada #1248a 38c Multicoloured, 1989 Mushrooms Issue, A VFNH Se-Tenant Block Showing "Dot on Boletus Mirabilis" From Position 42

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$10.00
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A well centered and VFNH se-tenant block of 4 of the 38c multicoloured stamps from the 1989 Mushrooms Issue, showing an unlisted "dot on Boletus Mirabilis", from position 42.  Printed on dull fluorescent Slater paper. It is not clear whether or not this variety is constant, or semi-constant. 

Unitrade does not list this variety, but a reasonable estimate of the value is $10. The block offered here grades 80 as follows:

Margins/centering: 50/70

Paper freshness: 5/5

Colour: 5/5

Impression: 5/5

Absence of visible paper flaws: 5/5

Perforations: 10/10