TWO BYZANTINE FOLDING KEYS
Circa 5th-6th century AD.
A bronze folding key with an openwork key bit; attached to a ring with notched edges. The other, an iron folding key with offset bit; attached to a ring (does not move).
L 45 mm (total); D 22 mm for the iron key/ring

Ex European private collection, acquired on the German art market before 2000.