It appears to be fmv. Mine did not show fmv the first couple years I had it but then was froze to the ground after the 2013-14 winter and the new shoots that came back exhibited fmv symptoms. This past winter it was damaged almost as bad but surprisingly the leaves look healthy so far.
I agree that this variety grows robustly regardless of whether it is exhibiting fmv symptoms or not. Some say symptomatic fmv results in more sensitivity to cold damage but in southern California this is a non-issue.
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