Bob-
You might want to change your topic title to something like "German Revenues to identify" to draw in more eyes.
There are plenty of people here who: (i) know far more than I about revenues, and (ii) have larger libraries to review.
The top left is a railway stamp from Prussia. The strip in the bottom scan is from the German state of Mecklenburg-Schwerin.
The wechsel stempels are bill of exchange revenues, pre-1900, so Forbin will list them. The einkommensteuer is an income tax revenue from 1922. Too late for Forbin.
The frachtstempel should be in Forbin, because I believe it is pre-1915. Again, someone with access to Forbin should be able to weigh in. I have a note that they were used on bills of lading, but that is subject to verification.
[edit: Actually, all of it is subject to verification.

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