For comparison, here is another die-stamped, hollowback Friedrich Linden IAB. This example uses the same exact hinge and pin as on your badge, but has a variation catch with catchplate.
And this solid-backed, maker-marked Friedrich Linden IAB has a different hinge than your badge, but the exact same catch that is seen on yours. There are quite a few variations that exist with these Friedrich Linden Infantry Assault Badges.
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