This is the classic Brehmer block hinge. Compare it to the ones on the Luftwaffe Flak badges and you will see the pedigree. The central pivot pin holds the retaining pin quite well and all still have the original dark color to them.
The head of the Brehmer eagle shows clear links to Juncker. The “tooth” in the beak is the clearest sign, but when you look closely you see the eyes are also nearly identical. There are plenty of ways to tell them apart, most easily note the much thicker, almost hairy legs on the Brehmer. The central claw on the right always has a notch in it. Most important note the wing does not touch the gun barrel.
The bright brass catch looks odd on the dark badge. It may be a replacement, though it is difficult to tell; if it is the work was masterfully done. Note even from above you do not see any excess solder.