The one positive aspect of our hobby is the vast number of
excellent reference books now available.
If you want to be able to identify both very basic insignia like this Jaeger patch
as well as the more obscure insignia, I'd recommend the Angolia/Schlecht books on the German Army & Luftwaffe; volume 1 of each will give you excellent basic information.
From there you can expand your knowledge of more specific topics as your interest
grows.
The bullion breast eagle appears to have field gray backing. Not often seen!
Here's mine! Mounted on a salty M42 uniform with added officers (M36) collar
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