Canada #790T5 17c Dark Green Parliament Buildings, 1977-1982 Floral & Environment Issue, A Very Fine Used Block on Piece Showing G2aC Tagging Error, on LF-fl Paper With Invisible Tagging

A well centered and very fine used block of 4 on piece of the 17c dark green parliament buildings stamp from the 1977-1982 Floral & Environmental issue, showing a G2aC tagging error, with one single tag bar toward the left side of the stamps. Printed on paper that reads as LF, but is actually DF-fl with a low density concentration of LF fibres.

Although not specifically mentioned in Unitrade, the parliament stamps are found with three distinct tagging strengths:

• invisible, where the stamp appears to be untagged.
• light tagging, where the tagging bars appear visible but not dark, being a light yellowish cream.
• dark tagging, in which the bands appear deep brownish yellow, and are very obvious on the stamps.

The vast majority of 17c stamps that I see have invisible tagging, and indeed the stamp offered here is this type.

The Adminware database lists this stamp at $5 per single, so a block like this should be worth at least $20. The block offered here grades 78 as follows:

Margins/centering: 40/60

Paper freshness: 5/5

Color: 5/5

Impression: 5/5

Absence of visible paper flaws: 5/5

Perforations: 10/10

Cancellation: 8/10