1 st\' century steppe bows...

[Flavivs Aetivs]

There are first century depictions in Bactria and NW India showing both Scythian and "Hunnic" style bows (Evan, you are making an artificial distinction between Sarmatian and Hunjic bows, as several Sarmatian bows have been found with handle laths). I suspect the 1st C AD was the last century of the transition period, wherein the Scythian bow was being phases out in favour of the Hunnic bow.

A new type of bow appears in the 6th which I label early Turkic - the laths are shaped very differently from earlier ones.

Yes, you are right, the Avars introduced a new set of bow Siyahs.

@Alanus
Also true, hard to say exactly how many bone lathes there were because only broken bows are found in burials. The Sarmatian culture developed before the Hun culture did, by the way. Hun culture didn't develop until 150-200 AD