PoStat4evR,
Here's my best stab at it. All references are to Horst Müller's 4-volume
Ganzsachenkatalog der deutschen Privatpost 1873 bis 1914. Scans open to larger versions.
1. Berlin Packetfahrt, PP129

2. Berlin Packetfahrt, probably PP82, PP83, or PP84

3. Berliner Privatpost & Spedition A.G. -- there are a handful of possibilities. To nail it down, I'd need the measurements and a shot of the reverse.
4. Brandenburg, P1

5. Brandenburg, PB1 minus Coupon 1

6. Krefeld, Express-Compagnie, probably P2

7. Krefeld, H.V. Express-Compagnie, P1

8. Krefeld, Express-Brief-Beförderung, P4 II

9. Chemnitz, Briefbeförderung Hammonia, P13

10. Frankfurt am Main, Privat-Circular-Beförderung, P7, probably P7 b

11. Frankfurt am Main, Privat-Brief-Verkehr, PF1 a

12. Frankfurt am Main, Privat-Circular-Beförderung, P1 a

13. Frankfurt am Main, Privat-Circular-Beförderung, P7, probably P7 f (see #10 above)
14. Frankfurt am Main, Privat-Brief-Verkehr, PP2 (subvarieties exist depending on text on reverse)

15. Frankfurt am Main, Privat-Circular-Beförderung, either P3 a or P3 b

16. Gera, Packetkarte "Courier", PB1

17. Chemnitz, Briefbeförderung Hammonia, P17

18. Hamburg, Hammonia, either P4 a or P4 b

19. Hannover, Privat-Stadtbrief-Expedition Mercur, one of the P7 varieties (additional varieties exist if text on the reverse)

20. Breslau, Hansa, one of the P4 varieties (additional varieties exist if text on the reverse)

21. Danzig, Hansa, P1, probably P1 VII

22. Stettin, Hansa, K2 I

23. Köln, Privat-Brief-Verkehr, P5.22

24. Heidelberg, Privatbriefbeförderung Mercur, P3

25. München, Privat-Stadtpost Courier, K3
