Ah yes, the tagging. Here is a link that has a database of tagging errors (another thing to look for!) and also explanations of tagging.http://www.adminware.ca/tagging/index.php
Mostly you must use an ultraviolet light lamp (UV lamp) mostly long wave for Canada, but the first stamps were visible under short wave like the USA uses, to see these tagging bars.
Different countries use different methods for these, sometimes all four edges are tagged, sometimes only one or two edges, sometimes shapes are tagged in the design of the stamp.
The second stamp you have shown is the Parliament buildings in Ottawa Scott catalogue #715, minimal value.
This also is listed in the cataloguie as available printed on gummed side only, but I agree, after reading the other opinions, that because the stamp is cancelled and now off paper it would have had to been soaked in water to achieve this and so, if it was indeed stuck to an envelope while gummed, the gummed side would have been the parliament side also and the back would have been cancelled.
In order to prove you have a 'printed on gummed side' stamp it would have to still be mint with gum and uncancelled because. The gum would not survive.
I did not know about these varieties myself. Thank you for asking about it.
Look and search on http://ebay.com
for 'CANADA 715a NH '78 14c Parliament PRINTED ON GUM $50.00' one is listed on there now and the centering is terrible. Most of this 14c value, printed on gummed side, were with terrible centering.
A regular used stamp, which this is, would sell for about 5c or 10c, on eBay
, to pay for all the fees and time, maybe 99c but because it is so common, it would have to have something special about t to sell for this much, like a special cancel or error like the missing brick or flag pole or something.