Germany Revenues More Info Please

here are some old german revenues from 1879-80 cancels plus some newer. rare common?

No idea but interesting. Here's hoping someone will have some ideas.

The top ones are Railway. I personally prefer them used.

They can llook simular, but are often a different series.

The top right stamp is Preussisch Hessische and the center stamp is kgl(Koningliche) Preussiche, although the stamps themselves are of simular design, they are different series.

The bottom stamps are wechsel stempel. revenue stamps mostly used on cheques.

The railway stamps are commion, the wechsel stamps I do not known, but I would not have high hopes.

The "Wechsel" stamps (last image) are listed in the Forbin catalog and were issued in 1879. You can download the Forbin catalog from Stamp Smarter.