German Hats (post war, Police/Fire/unknown)

I acquired a bunch of post war German hats. Looks like Police, Fire, Border guard, East and West German. Maybe some military. Is there some sources I could use to easily identify what something is? Is there anything here particularly valuable?

1. Attachment 126519
2. Attachment 126509
3. Attachment 126508
4. Attachment 126507
5. Attachment 126506
6. Attachment 126505
7. Attachment 126504
8. Attachment 126503
9. Attachment 126502
10. Attachment 126501
11. Attachment 126500
12. Attachment 126518
13. Attachment 126517
14. Attachment 126516
15. Attachment 126515
16. Attachment 126514
17. Attachment 126513
18. Attachment 126512
19. Attachment 126511
20. Attachment 126510
21. Attachment 126520
22. Attachment 126521
23. Attachment 126522

Look to see if any have a Nato Stock Number, a 13 digit number. If the 2nd block of 2 numbers is 12 it is West German military, prior to German unification, or if it was made after unification just German military.

The East German Army liked to stamp kit with "NVA" (Nationale Volksarmee) but these markings can be feint.

Just saw this post and can add this. The white ones are Poleizi. Each region has its crest as part of the emblem. Even the Post Office had fancy hates, but I don't remember what the symbol for the Post is. I spent time in Germany with the Army in the late 80s. My father-in-law lived in Germany just after the war (his dad was Army) also. Ed spent almost 30 years in the Coral Gables Fire Dept in Florida and did a lot of traveling and hosting foreign visitors. He has quite the foreign fire helmet collection.

No 22 looks like South African police.