Here are pictures of the cap : I picked it up at an auction and don't know much about it. I've had one person tell me it was a Veterans cap and another tell me that is was the hat used by General's of the SS/Wehrmacht in the 30's and that it's part of the Black uniform that was introduced in 1932. From looking at pictures, I personally can't tell. I can take more pictures if needed. Thanks!
Not sure at first about the eagle but it does look like WW1 veterans hat. Quick google popped it up okay.