Canada - opinions on incomplete perfing?

This should be due to the way Canadian sheets were laid out in the day.  A sheet consisted of (usually) 4 panes, which were trimmed to a more manageable size (100 small-sized definitives or 50 larger commemoratives).  The original sheet wasn't always perforated all the way to the outside, so if you imagine the centre cross made during cutting the sheet into panes, those inside edges will have holes that go right to the edge of the selvedge, whereas the edges along the outside of the full sheet will often be incompletely perforated.  This gets complicated a bit more by the odd habit we had for quite a while of keeping two different kinds of corner blocks.  Blocks with wide selvedge had the plate inscription printed on the selvedge ("philatelic stock") and blocks with narrow selvedge had the inscriptions trimmed off and thrown away ("field stock").  Postmasters would complain that people would raid the post office for inscription corner blocks and would ignore the other stamps in the pane, so the solution for a while was "field stock" - you couldn't get any plate inscriptions at a normal post office, they had to come from philatelic centres.  Postmasters really complained during the time when there was only one inscripted corner block per sheet, rather than the eventual method of putting an inscription on all 4 corners.  (Did we ever have sheets that only had 2 or three corners with corner inscriptions?  Older inscription corner blocks are sometimes valued differently depending on whether it's the upper right, upper left, lower right or lower left, and I've never figured out how you could have anything other than "every corner on the pane gets an inscription" or "one corner on the pane gets an inscription, but all 4 panes get an inscription on a different corner".  In either case, you should end up with the same number of inscription blocks on all 4 orientations.)

There are some issues (off the top of my head, early tagged stamps) that were never issued as philatelic stock, so they all have narrow selvedges.  Some corner blocks are catalogued two ways, with different amounts of selvedge trimming - I think you can find some of the QEII Wilding definitives listed that way, with wide and narrow selvedges.  But I don't think I've ever seen any differentiation between selvedges that are fully perforated (inside pane edges) and those that aren't (outside pane edges).  That is, not until much later on, e.g. defintive stamps from post-1985 or so.  I think some differences in the printer contracted for later issues can be seen in how much of the selvedge is perforated (you can also tell who printed the stamp by the letter that goes along with the traffic lights on corner blocks, "H" for Harrison and "R" for Rolland and so on).  Of course, there is much interest in the lathework on KGV Admiral definitive selvedge - this lathework would only come from the outer edges of the full sheet, not from the inside pane edges.

I can't imagine it would matter a whole lot to me whether my selvedge was fully perforated or not, with the obvious exception of blocks which were poorly separated from the sheet.  It seems like there is a huge percentage of the population that never grasped the idea of folding the stamps back and forth over the perforation to make them easier to separate.  When you do that, you get a nice crease over any unperforated selvedge, and the stamps are easy to tear cleanly.  If you don't, you might end up with a nasty ugly tear and that would not be nice to collect on a block.  (Canadians never did get around to cutting unperforated selvedge with scissors on an angle, as they like to do in GB and Australia).

Ryan

Opinion from a distant observer.
The amount of Canadian material on the market is vast,
The desirability and prices,  I could imagine, would only be affected by dedicated block collectors,
as observed in "Centreing" desirability, the rate of value change is moot.
A fully perfed item would be desired over a blind perf block but to what degree?
For similar blocks without selvedge, I would think minimal at best.