German Fiscal Stamps. Need Help For Identification Or Find Catalogue

Can anyone tell me which catalog can answer my questions about these stamps? I'm interested in the years of production and other details

4th - 5th row Deutsche Arbeitsfront stamps dated from 1933
Do some research yourself_many websites cover these stamps Try to learn some german
https://bhzmilitaria.com/militaria-...tgliedsbuch/

Thank you. I was able to find everything except the stamps with the inscriptions "Mittelfranken" and "Oberbayern". I dug through the entire Internet :(

The Oberbayern examples are insurance revenues from the early 1900s. There are issues from 1912 and 1917, I think, but I don't think I have a good list. I can look tomorrow. I assume the stamps were used for payment of premiums, but I don't know if they were paid monthly or quarterly. You might be able to find more information on the internet using that additional information.

I can't speak to the Mittelfranken examples, though the form of them might have me guessing that they filled a similar purpose.

If there is a swastika, it, likely, is from 1933 - 1945.
There, also, is a Bavarian railway stamp.

Thanks!

From the picture of these stamps (Oberbayern) I was able to find something similar with the year of production here, I don't know how true it is: https://www.stampsofgermany.com/rev...lin-w498.htm
Mittelfranken look completely different

You may want to see "Catalog of the old Bavarian railroad and revenue stamps 1870-1924" by Martin Erler. I have not seen this book so can't comment on its usefulness. Out of print but available from the APRL.