IMO an original badge with a possible replaced hinge. I haven't seen a Berg & Nolte Flak kampfabzeichen with a sheet metal folded hinge before, only a short block hinge or a narrow barrel hinge. The 'C' type roundwire catch is correct for this badge, which was only ever produced in zinc.
'I do not think we can hope for any better thing now.
We shall stick it out to the end, but we are getting weaker of course, and the end cannot be far.
It seems a pity, but I do not think I can write more. R. SCOTT.
Last Entry - For God's sake look after our people.'
In memory of Capt. Robert Falcon Scott, Edward Wilson, Henry Bowers, Lawrence Oates and Edgar Evans. South Pole Expedition, 30th March 1912.
looks ok to me to.
It appears to be a good B&NL flak badge with a replaced hinge as Ned has stated.
Searching for anything relating to, Anton Boos, 934 Stamm. Kp. Pz. Erz. Abt. 7, 3 Kompanie, Panzer-Regiment 2, 16th Panzer-Division (My father)