The first and fourth stamps hare cancel with a "Duplex handstamps": with two parts:
the circle dated stamp and the "killer" this second part made with evay lines...
the second and third stamps hare cancel also with a duplex: the second part
of this duplex hare made of a rectangulaire killer with special information, the call it "Slogan cancelation"
I'm after some information about the postmarks, cancellations on these stamps. The other Canadian stamps the postmarks are wavy but these aren't
