Thanks for the replies and welcome.
Let me provide a little bit of the back story here. I purchased this Swiss collection from a very well known dealer and I focussed on the description that it would be pretty complete from the 1930s to the 1970s.
I got the package yesterday and opened it up and it is a Lindner style album and on the front page I see Zumstein 2, a 6 rappen Zurich cantonal and a Zumstein 8, the Basel Dove. I am pretty surprised and question whether they are real and might be copies from a catalogue that were cut out and mounted because the original owner of the album liked to se these. I didn't think I paid enough for these stamps to be in the group I bought. Based on catalog, these are pretty expensive items.
I also noticed this Bern cantonal and questioned whether that was even real. I never heard of a Bern cantonal.
I have rescanned and show all three stamps.
The Bern revenue stamp was affixed (unbeknownst to me) on a backing paper which I have removed and it shows that it was clearly cut with a scissor. I now understand it is a revenue stamp. Question: How can I understand that the cancellation is a revenue cancellation? Is it the fact that the mark has letters?
I also have here the Zurich 6 rappen and the dove. I am really not sure that these are real and the color of the dove seems odd, but could be the 8I version.
I'd appreciate any thoughts about what I have got here.
