Balkans / Byzantium / Rus / Europe / Scandinavia
Such scales with bosses are well-known as a part of big set of scales from Birka garrison (scales type F) but their motherland is Balkan Peninsula and Byzantium Empire. We also can meet the depictions of similar scales in Stuttgart Psalter… ans etc.
Squama armour of various kinds was popular during whole history of military equipment. The earliest squama armour we meet at least 1600 years B.C. All information about squamas is collected here in the Facebook SQUAMA armour discussion group.