These are part
of a form of belt buckle. They are not a dragon, but an S. Very few have the dots and most are actually round in cross-section. They link to plain round rings (as here), or buckle plates, either D-shaped or square with perforated decorations and a loop on one side
The are found in northern Serbia
, northern Bulgaria
, eastern Romania
and the Crimea.
They are generally dated to the second half of the 5th century (but were used into the 6th) and are associated with the Ostrogoths who migrated into the lower Danube at that time from the Crimea region.
, Elementi na germanskija fibule kostjum na jug
ot dunav (Elements of Germanic Fibulae
and Costume from South of the Danube), page 229-236.