Other standards had no heads at all, just the fabric tube, while some had heads looking like wolves or even fishes. The images below show part of the Arch of Galerius with several dracos., which to me sounds like the standards we're discussing here.The draco was also used by the Dacians (or their allies) and no less than 20 of these are shown on Trajan's Column.
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The open mouth shows triangular teeth, but no fangs or canines.
A crenellated crest is attached to the top of the head.
These Thracian horsemen had a deity which resembled a 'flying' serpent with scales, teeth and an upstanding crest, which may well have been a draco or something similar. But since this source was probably compiled later, we can't be sure this has any bearing on a dating.
We are on more solid ground with the entry of the reign of Gallienus (253-268 AD), when legionary troops are said to have paraded with a dracon amongst the standards of the legions.
The head looks more like a dog (with ears) than a dragon.
The one beside it has a much more serpentine head, and has scalloped rings attached to the tail.The draco Standard was originally developed by the cavalry peoples of the steppes, such as the Sarmatians and the Alans, but also by the Parthians and the Sassanid Persians.It may have been used primarily to determine the wind-direction for the horse archers. The hollow head, in the form of a toothed dragon, was formed from metal and the wind passing through it would extend the cloth tube tail attached to the neck of the head.The only fully preserved draco was found in the Limes fortress of Niederbieber in Germany, which dates to the 3rd century.This copper alloy object was discovered near the SW edge of the (civilian settlement) outside the fort.This may lead us to conclude that the infantry began using dracos during the late 3rd c.