If original, then it is an early pattern SA desk eagle. The pieces on the rear would be the attachments for the stand. These are very often mistaken for wall eagles. Many replicas are out there though, and they are very similar to this example. Somewhere, I have an image of an original example. I will try to compare them and post back later.
Currently working on several KZ related projects, including items for the USHMM, Groß-Rosen Museum and various private concerns and studies. Available as a guide to KZ sites, contact for details.
"maka akaŋl oyate maŋi pi ki le, tuweŋi wíyópeya oki hi sni"