Hey Wert, looks like none of those stamps you posted are of the reverse offset variety.
see post from earlier
https://goscf.com/t/51964&SearchTerms=offsetI would love to see a great scan copy of the 14 cent dog. Might be the PELURE paper variety. Thinish paper.
As for the color "bleeding" through the stamps, there is some concerns nowadays regarding the type of plastic mounts used back in mid 1900's. The mounts chemically altered the stamps themselves, especially with the blue inks, causing the ink to bleed through.
I believe the dealer Kasimir Bileski was known to use these plastic stamps mounts. (someone correct if I a wrong)
p.s. here is a great article about Bileski
https://www.saskatoonstamp.com/article_bileski.aspTrodent