This might help:
Original (green case)
01xxxx = AR8200 Japanese market
07xxxx = AR8200 World
55xxxx = AR8200B US blocked version
MarkII (black case)
08xxxx = AR8200 World
MarkIII (black case, MK3 printed below right of display)
05xxxx = AR8200B US blocked version
09xxxx = AR8200 World
15xxxx = AR8200U US 'Government' unblocked version
55xxxx = AR8200B US blocked version