Hello guys, I am new to this forum, and also fairly new to insignia other than US. I recently purchased a fair size collection of what I think are West Germany badges. There were a few "de-nazi-fied (?) pieces, but the majority are like these and are made of cheap metal. There are also some pocket hangers, patches, ranks, etc. However, I have a few questions: Are there are any reference books to badges like these pictured? Is there any point in collecting the same badge, but made by two different manufacturers? Do badsges like these have any value as of now? About what time period would these have come from? 60s-70s? Any help would be GREATLY appreciated, as I literally know nothing of these. Thanks!!