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Having an american model and an international model would actually suit sony better, it reduces the liklihood of grey imports, it reduces costs per unit slightly (singleband cheaper than triband) and at the same time it would slightly increase battery life since the radio would only ever have to scan the one frequency band if it ever lost coverage.
As far as the logistics, switching production between the two versions would be very simple since it was only the one component and depending on how they are setup, the same production lines might be used for both the 300 and 600 as well and those would certainly need more changes for their batches.
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