FOUR BYZANTINE BRONZE SLIDING KEYS
Circa 5th-7th Century A.D.
Each L-shaped, the bit with raised teeth at a right angle to the rectangular shaft, and terminating in a open ring, some with incised linear ornament
2½ in. (6.3 cm) long for the largest (4)
Lot Essay
For a related example see no. 1 in Vikan and Nesbitt, Security in Byzantium: Locking, Sealing, and Weighing.