Canada #865var 35c Multicoloured, Uranite Structure, 1980 Uranium Discovery Issue, A VFNH UR Inscription Block Showing the Unlisted "Extra Atom" Variety From Position 9

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A very fine NH mint upper right inscription block of the 35c uranite structure stamp from the 1980 Uranium Discovery Issue showing the unlisted "extra atom" variety on the lower left stamp, being position 9. It is not clear whether or not this variety is at least semi-constant, but it is quite striking even if it isn't. 

Unitrade does not list this variety, but my estimate of the value is $10. The block offered here grades 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

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