Interesting:
http://www.ne.jp/asahi/luke/ueda-sar...atterns_1.html
Shield Patterns from:
ca. 700-630 BC - 22 patterns
ca. 630-590 BC - 5 patterns
ca. 590-540 BC - 19 patterns
ca. 540-500 BC - 48 patterns
ca. 500-475 BC - 26 patterns
ca. 475-430 BC - 50 patterns
ca. 430-400 BC - 7 patterns
ca. 400-350 BC - 12 patterns
ca. 350-300 BC - 8 patterns
Enjoy.
