Canada #505-505p, 506-507 6c 1970 Manitoba Centennial, Northwest Territories Centennial And United Nations Biological Programme Issues, 16 VFNH Singles On A Variety Of Smooth And Ribbed Paper, Mostly Unlisted. With LF Backed 505 & Smooth 507

16 VFNH singles of the 6c from the 1970 Manitoba Centennial, Northwest Territories Centennial And United Nations Biological Programme Issues on a variety of smooth and ribbed paper, mostly unlisted. with LF backed 505 & smooth 507. The LF backed paper on 505 and smooth papers on 507, which is nearly always horizontally ribbed. Unitrade as basic stamps is $4.50 but the smooth paper 507's should be worth at least $5 each. So my estimate on this is $15.
Includes:
505
-NF deep violet grey/ LF bluish white
-W2B, NF deep violet grey/DF greyish white - wide & narrow tag spacings,very streaky gum
-W2B NF brownish grey /DF greyish white very streaky gum
-NF deep violet grey/LF greyish white, streaky gum
-NF deep violet grey/ DF yellowish, streaky gum
-As (1) smooth gum
-As (5) smooth gum
506
-HB level 10
-HB level 11 - smooth and streaky gum
-HB level 12 - streaky dex
507
-DF grey horizontal ribbed
-DF cream horizontal ribbed
-DF cream smooth paper
-DF grey smooth paper

Our estimated value is $15. The stamps offered here grades 80-84 as follows:

Centering/Margins: 50/70-54/70

Paper Freshness: 5/5

Colour: 5/5

Impression: 5/5

Absence of Visible Paper Flaws: 5/5

Perforations: 10/10

The NWT Centennial issue uses the same paper as the Canada Games issue and the earlier Henri Bourassa issue, in that it is generally always HB 12 or HB 11. The Biological programme issue is always DF and varies from cream in colour to grey, with the grey being the most common. Both smooth and horizontally ribbed types exist, with the ribbed predominating.The Manitoba Centennial uses a new chalk-surfaced LF-fl paper that appears either DF or NF on the face, and DF or LF on the back. I have done my best to capture these differences by taking pictures with my camera under UV light, but the differences can be harder to see than in real life. That should be borne in mind if you are looking at the scans and cannot tell the difference between them.