Zinc based and in a very good, slightly worn condition with all of the dark oxidized finish still present.
Not marked but a known variation that has been attributed to the company of C.E. Juncker, Berlin. With the typical oblong shaped catch plate.
See Mark Garlasco, The Flak Badges.

Zinc based and in a very good, probably unworn condition with all of the dark finish still present.
Not marked but a known variation that has been attributed to the company of C.E. Juncker, Berlin. See Marc Garlasco, The Flak Badges.
Very uncommon badge.

In a very good, slightly worn condition with all of the dark oxidised finish still present.
Not marked but a known variation that has been attributed to the company of C.E. Juncker from Berlin. With the typical rectangular plate under the hook. See GCA database.
Uncommon badge.