Unknown Cat.no's For Austrian Stamps

I'm reviewing a mini-collection that I acquired some years ago and resolving some issues with unknown catalogue numbers.
For the following, most are Back-of-the-Book issues, including Post Cards, Revenue Stamps, and who-knows-what.

No.1 looks like Cat No. P39, except P39 is imperf.



No. 2 is a Postcard



No. 3 is a pre-printed letter.




No. 4 is printed on extremely this paper, vellum-like.



No. 5 - Might be a revenue or tobacco stamp, or?




No. 6 is another Post card




No. 7 is also a post card, looks similar to Scotts #27, but brown instead of yellow. Writing exists on the backside.

Oh, I think there is a footnote underneath the newspaper stamp issues saying that they were sometimes privately perforated....

New12Collector.
Thanks for the rapid input;
The first one matches P39, except P39 is imperf. I see no Perf's with the same denomination.

Art

For No. 1, as new12 indicates, imperforate stamps were perforated privately for the convenience of the user. No. 2 is a revenue, as are all "stempel-marke's".

Thank you.
Art