Ariel:
When looking at hybrid examples, I am always of two minds. Does this represent temporal hybridism or geographical hybridism? In other words, are we looking at a transition between two forms that occurred over time (i.e., temporal evolution within a specific region), or, as you suggest, the mixing of two different styles in an intervening region?
Without provenance of specific pieces, I don't think one can distinguish between these two possibilities.
Ian.
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