Canada #790T2 17c Dark Green Parliament Buildings, 1977-1982 Floral and Environment Issue, A FNH Single With G2aC Tagging Error on DF Paper

A FNH single of the 17c dark green Parliament buildings stamp from the 1977-1982 Floral and Environment Issue, with 1-bar G2aC tagging error on DF paper.
Adminware lists a VFNH example at $25, so a fine example should be worth approximately $15. The stamp offered here grades 70 as follows:

Centering/Margins: 40/70

Paper Freshness: 5/5

Colour: 5/5

Impression: 5/5

Absence of Visible Paper Flaws: 5/5

Perforations: 10/10