Canada Stamps #579a - Collection of 4 Varieties - Normal & "Missing Medallion" in DF/DF + DF/LF

A very interesting little study collection of four different varieties on the first of the two pairs issued in 1976 on the Iroquoian Indians! As stated in the catalogue, this stamp was commonly issued on a dull fluorescent paper front and back (DF/DF). But it was also issued on a much scarcer paper which is low fluorescent on the back (DF/LF) and brighter than dull version. There is also a "missing medallion" variety found on only six stamps of the pane (pos.  4, 10, 20, 30, 40 & 50). However the panes of the scarcer low fluorescent version also contains the "missing medallion" variety, which is unlisted in the catalogue on LF paper. Therefore this collection contains:

• #579a: Pair on DF/DF paper
• #579ai: Pair on DF/LF paper
• #579i: Pair with "missing medallion" on DF/DF paper (unlisted as a pair)
• #579i: Pair with "missing medallion" on DF/LF paper (unlisted on this paper)