Quiz, what 's caused the staining on this gable end?

http://www.leodis.net/display.aspx?I...1&DISPLAY=FULL

ISTM that finial (?) is well above the height that roof water could
spill over, that seems to be happening further down the roof in a
symmetrical fashion. and to a much lesser extent anyway.

There won't be any leaking gutters, how's all that water get up there,
assuming it is water?

DG