2 cent green 1 cent yellow Canadian stamp in Plymouth, Devon for sale

((Make me an offer)) I have a 2 cent green Canadian stamp and 1 cent yellow on same envelope, the yellow is very rare in the face it is printed over perforation as seen in picture, the both have tell tale black doted lines, which suggest the older paper type of stamp. I am very curious to see what offers are made, I have been given several valuations, and obviously post office stamp does reduce value, as it marks some of face. Just to confirm these are not on sale at £1 but I would like to see what interest there is and values offered, I also have a rare 1898 Canadian Xmas empire map stamp on envelope, this is rare as it most likely came from plate number 4 which was in perfect, and red die goes over map lines in sever places. Internet searches will give more detail.