Canada 929 Papers: Ashton Potter

Hello Folks,
I don't have access to a Unitrade Specialized so I may be making a fool of myself here but I 'm looking for all general information on the two Ashton-Potter plates used in the printing of Canada 929, The Cradle. I only know about the Abititbi Price and Clarke papers.
Thanks,
Ugruk

Hello Ugruk
Here are the two A-P plates - Harrison and Clark (Two early American explorers, I understand;)



Unitrade Editor adds a paragraph explaining how the brown colour on Plate No. 1 must be a true variety and not a case of missing colour.

Past forum member wert posted this green version (possible forgery) and the research response.

Unitrade catalogue gives the following dates, but I am guessing the plates correspond with the printings.

Abitibi Price paper Apr. 8, 1983 - plate 1?
Clark paper Dec 19, 1983 - plate 2?

Edit- no change

Thanks for all of this folks.
I will post the two, major variety, Ashton-Potter inscription blocks that I have, once I am happy with the photography, but I still don't quite understand how the Ashton-Potter inscriptions relate to the Abitibi-Price and Clarke papers. How does one tell what's what?

Both Clarke paper and Abitibi-Price paper have clear gum and the papers are indistinguishable between them.

The only way to distinguish them is a letter indicator on the plate block's inscription [ C, APP, HP, TRC, etc. ] or information provided directly by Canada Post.

In saks' answer, Unitrade must have used Canada Post information to state that plate 2 is Clarke. Therefore, the non-numbered plate block must be Abitibi-Price.

|Harrison paper was only used on the SC 928 39 cent, SC 930 50 cent and SC 933 68 cent stamps in this series.

corrected spelling.

Thanks very much for this.
My! There's so much to learn.